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Is the Earth itself a giant living creature?

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Monday, April 22, 2024

Rachel Victoria Hillis for Vox An old, much-ridiculed hypothesis said yes. It’s time to take it seriously. In the 1970s, chemist James Lovelock and microbiologist Lynn Margulis put forth a bold theory: The Earth is a giant living organism. When a mammal is hot, it sweats to cool itself off. If you nick your skin with a knife, the skin will scab and heal. Lovelock and Margulis argued that our planet has similar processes of self-regulation, which arguably, make it seem like the Earth itself is alive. The idea wasn’t unprecedented in human history. “The fundamental concept of a living world is ancient,” says Ferris Jabr, a science journalist and author of the upcoming book Becoming Earth: How Our Planet Came to Life. The book explores all the ways life has shaped our physical world and, in doing so, inevitably revisits the question “Is the Earth alive?” Lovelock and Margulis called the idea “the Gaia Hypothesis” — named after the ancient Greek goddess of the Earth. It was openly mocked by many in mainstream Western science. “For many decades, the Gaia hypothesis was considered kind of this fringe sort of woo-woo idea,” Jabr says. “Because for biologists,” Jabr says, life is a specific thing. “It is typically thought of as an organism that is a product of Darwinian evolution by natural selection. And Earth as a planet does not meet those criteria.” It didn’t help that the original articulation of Gaia granted Earth a certain degree of sentience. The hypothesis argued “all of the living organisms on Earth are collaborating to deliberately create a climate that is suitable for life,” as Jabr says. But yet, this idea has persisted, for a few reasons. Scientists have never been able to precisely define what life is. So, it’s been hard to dismiss Gaia completely. The Gaia hypothesis has also evolved over the years. Later iterations deemphasized that life was “collaborating” to transform the Earth, Jabr explains. Which still leaves a lot to be explored: Certainly living things don’t need to be thought of as conscious, or have agency, to be considered alive. Consider the clam, which lacks a central nervous system. Jabr found in the years since Gaia was first introduced, scientists have uncovered more connections between biology, ecology, and geology, which make the boundaries between these disciplines appear even more fuzzy. The Amazon rainforest essentially “summons” its own rain, as Jabr explains in his book. They learned how life is involved in the process that generated the continents. Life plays a role in regulating Earth’s temperature. They’ve learned that just about everywhere you look on Earth, you find life influencing the physical properties of our planet. In reporting his book, Jabr comes to the conclusion that not only is the Earth indeed a living creature, but thinking about it in such a way might help inspire action in dealing with the climate crisis. Brian Resnick spoke to Jabr for an episode of Unexplainable, Vox’s podcast that explores scientific mysteries, unanswered questions, and all the things we learn by diving into the unknown. You can listen to the full conversation here. This interview has been edited for length and clarity. Brian Resnick Do you think the Earth is alive? Ferris Jabr I do. I think Earth is alive. We can think of Earth as a genuine living entity, in a meaningful sense, and in a scientific sense. There are four parts to the argument that substantiate that statement. Brian Resnick What’s the first? Ferris Jabr Life isn’t just on Earth. It literally came out of Earth. It is literally part of Earth. It is Earth. All of the matter that we refer to as life is Earth animated — that’s how I come to think about it. If you accept that, then at a bare minimum, you have to accept as a scientific fact that the surface of the planet is genuinely alive, because it is matter that has become animated. Brian Resnick Earth animated? What do you mean by that? Ferris Jabr Every single living organism is literally made of Earth. All of its constituent elements and components are parts of the planet. We all come from the planet. We all return to the planet. It’s just a big cycle. And so life, the biological matter on the planet, is literally the matter of the planet, animated. It is living matter. Imagine a vast beach and sandcastles and other sculptures spontaneously emerge from the sand. They are still made of sand, right? They’re not suddenly divorced from the beach just because they’ve arisen from the beach. Those castles and sculptures are still literally the beach. And I think it’s the same with life and Earth. Brian Resnick So, the physical components of Earth are the material of life. And so distinguishing these two — Earth and life — seems silly because they comprise each other? Ferris Jabr The more you think about this, the more the boundaries dissolve. Every layer of the planet that we’ve been able to access, we find life there. And in the deepest mines that we have dug, we continue to find microbes and sometimes even more complex organisms like nematodes, these tiny, worm-like creatures. Brian Resnick So all life contains Earth, and Earth contains life? Ferris Jabr There are components of the Earth that are not alive in any way. The center of the planet, it’s all molten rock and there might be some solid metal in the core. But think about a redwood tree: It is mostly dead wood in terms of its volume and mass. It is mostly nonliving tissue. And then a little bit of tissue that is laced with living cells. So, you know, most complex multicellular living entities are a jumble of the animate and inanimate. Earth is not unusual in that way. Brian Resnick What is part two of your argument? Ferris Jabr All these organisms [on Earth], they give Earth a kind of anatomy and physiology. Life dramatically increases the planet’s capacity to absorb, store, and transform energy, to exchange gases, and to perform complex chemical reactions. Brian Resnick What’s a good example of this? Ferris Jabr You can think of all of the photosynthetic life on the planet acting in concert. It’s not that they’re deliberately collaborating to do something, but they’re all doing their own thing at the same time. NASA has made these amazing videos and animations and they’ve literally called them “Earth breathing,” because you can see how the levels of carbon dioxide and oxygen in the atmosphere fluctuate with the seasons. The amount of vegetation that rings the continents, especially in the Northern Hemisphere, in the mid-latitudes, it changes dramatically with the seasons. It has a sinuous rhythm. It looks like a pulse or like breathing. Brian Resnick So, are you saying something like all of the algae or plankton in the ocean are generating this together? … Is that kind of like how all of the cells in my lungs are working together to exchange gases? Or is that not quite the right way to think about it? Ferris Jabr I think we have to be careful with making too direct a comparison. You as an organism are a product of evolution by natural selection. Your structure, your anatomy is something that was written into your genome. That’s not how the Earth system formed. Brian Resnick I’m realizing a key to this conversation is what you just corrected me on. When we’re discussing this notion about the “Earth being alive,” we’re not suggesting it’s not alive in the same way you and I are. But there’s these equivalent processes that look very similar to the way my body maintains homeostasis, for example. It’s not like the Earth is exchanging gases and doing metabolism-like things in the way I’ve been evolved to. It’s not achieving homeostasis the way you or I do. But yet it is doing something that seems analogous. Is that the kind of thing that you’re arguing here, overall? Ferris Jabr Absolutely. When we’re looking at the planet, we see life-like qualities, things that resemble the characteristics of the organism, which is the most familiar life form to us. But it is not exactly the same. It is still genuinely alive, in my opinion, but is not exactly an organism. Life is a phenomenon that occurs at multiple scales. The way I think of it is that it’s not identical at all of those scales, but it rhymes and there are analogies between each of those scales. I like to think of a leaf on a tree in a forest on a planet. There’s no disagreement whatsoever within science that the cells that compose that leaf are alive. The tissues that those cells form are alive. The leaf as a whole is a living tissue. The tree we consider an organism that is also alive. We consider each of those layers to be alive. There’s no debate or controversy about that. Once we go above the scale of the organism, this is where the debate begins. Can we think of the forest, the ecosystem, as alive as well? And then one more level higher. Can we think of the planet as alive? My argument is, yes, that each of those levels, each of those scales is equally alive but not identical. And there are analogous processes that happen at each. But they’re not exactly the same. Brian Resnick What is the next plank of your argument? Ferris Jabr Life is also an engine of planetary evolution. The planet evolves over time dramatically. It is not exactly the same as standard Darwinian evolution through natural selection, but it is very much a type of evolution. Organisms and their environments continually co-evolve. Each is profoundly changing the other. This reciprocal transformation is responsible for many of the planet’s defining features: for our breathable atmosphere, our blue sky, our bountiful oceans, our fertile soils. This is all because of life and because of the way that life has changed the planetary environments. These are not default features of the planet. Life has created them over time. Brian Resnick What is the most stunning example of how life has actually changed the planet? Ferris Jabr In the beginning, Earth had essentially no free oxygen in its atmosphere, and the sky was probably a hazy orange. And when cyanobacteria began to oxygenate the atmosphere through the innovation of photosynthesis, the sky probably started shifting toward the blue part of the spectrum. The entire chemistry of the planet changed. I mean, you suddenly had an oxygen-rich environment, whereas before it was an oxygen-poor environment. That changes absolutely everything. Brian Resnick Okay, so to get back to what you were saying before, it’s not that Earth evolves in the same way that organisms evolve. But it evolves with a different mechanism, is that right? Ferris Jabr Evolutionary biologists will say a planet cannot evolve because it doesn’t have a cohesive genome. There’s no genetic inheritance going on; there’s no sexual reproduction going on. But there are analogous processes by which changes are passed down from generation to generation that are not genetically encoded. If we think about a bunch of large mammals, they’re transforming their landscape by walking through it with their immense hefts. They’re tearing down vegetation. They’re digging in, uprooting things. They’re changing the landscape. Those changes persist. And so their descendants now are evolving in a new environment changed by their predecessors. These environmental changes are not themselves genetically encoded, but they are being passed from generation to generation, and they are inevitably influencing the evolution that follows. Brian Resnick If a fundamental part of life is that it changes the world in which it exists, how are we different for accelerating the climate crisis? Because you look at the history of the Earth and you say, well, life has powerfully changed it. Who’s to say what we’re doing is necessarily not a natural process? Ferris Jabr It’s simultaneously humbling and empowering to recognize ourselves as simply the latest chapter in this long evolutionary saga of life changing the planet. It is a basic property of life to change its environment, and we’re not an exception to that. But I do think there’s a major distinction between what our species has done and what has happened before in terms of the combined scale and speed and the variety of our changes to the planet. I don’t think there’s any species or creature before us that has changed the planet on such a large scale so quickly and in so many different ways simultaneously. We have radically altered the atmosphere, the oceans, and the continents. We’ve done it in a couple of centuries. That’s a huge part of the reason for why the crisis we’re going through right now is a crisis. It has so much to do with the scale and the speed of it. Brian Resnick What’s part four of your argument? Ferris Jabr This co-evolution, on the whole, has amplified the planet’s capacity for self-regulation and enhanced Earth’s resilience. Earth has remained alive for, you know, around 4 billion years, despite repeated catastrophes of unfathomable scale, unlike anything that we have ever experienced in human history. We have to account for that resilience, for that incredible persistence through time. It is not a deliberate thing. You know, it is not a conscious or collaborative thing. It is simply an inevitable physical process, just as evolution by natural selection is an inevitable physical process. Even in the mass extinctions in Earth’s history, life recedes to its most fundamental and most resilient forms: microbes. And then life sprouts from there. Brian Resnick Are you sure you’re right about all this? Is the scientific community coming around to accept this notion that Earth is indeed alive? Ferris Jabr I mean, this book is my personal synthesis, an argument. You know, this is my viewpoint. This is how I have come to see the Earth. There are scientists who agree with me, but I would not say that this is the consensus of modern mainstream science. I think the statement that Earth is alive remains quite controversial and provocative. However, everything else we’ve been talking about, the co-evolution of life and environment, the fact that life has profoundly changed the planet. These are all well-accepted points. Brian Resnick Which part are you most likely wrong about? Or which part do you feel like has the most room for doubt? Ferris Jabr We do not have a precise, universally accepted definition of life. We haven’t explained it on the most fundamental level. Like 100 years from now, will we have a fundamental explanation for life that we’re missing right now? And if we do, will that make thinking of planets as alive defunct? And so, I think open-mindedness is fundamental to any scientific thinking or scientific process. And we have to be open to the idea that a century from now, or even sooner, all of this will be wrong. And that’s part of what I find thrilling: We don’t have all of the answers yet. Right? These are incredibly challenging ideas and concepts that we are still working out. If we had figured it out, then we wouldn’t be talking about the Gaia hypothesis anymore. The Gaia would have been officially dead a long time ago. But I think the reason that it remains relevant and continues to be debated means that we just haven’t figured it out yet. Brian Resnick Why is it useful to think of the Earth as alive? Ferris Jabr There’s a massive difference between thinking of ourselves as living creatures that simply reside on a planet, that simply inhabit a planet, versus being a component of a much larger living entity. When we properly understand our role within the living Earth system, I think the moral urgency of the climate crisis really comes into focus. All of a sudden it’s not just that, oh, the bad humans have harmed the environment and we need to do something about it. It’s that each of us is literally Earth animated, and we are one part of this much larger, living entity. It’s a realization that everything that we are all doing moment to moment, day to day, is affecting this larger living entity in some way. Brian Resnick So, the simple point that you’re making is that we are Earth, and don’t self-harm. Ferris Jabr Right, exactly.

An illustration of a land mass is covered in wildlife, lush greenery and people all interacting. Blue water and sea life surrounds.
Rachel Victoria Hillis for Vox

An old, much-ridiculed hypothesis said yes. It’s time to take it seriously.

In the 1970s, chemist James Lovelock and microbiologist Lynn Margulis put forth a bold theory: The Earth is a giant living organism.

When a mammal is hot, it sweats to cool itself off. If you nick your skin with a knife, the skin will scab and heal. Lovelock and Margulis argued that our planet has similar processes of self-regulation, which arguably, make it seem like the Earth itself is alive.

The idea wasn’t unprecedented in human history. “The fundamental concept of a living world is ancient,” says Ferris Jabr, a science journalist and author of the upcoming book Becoming Earth: How Our Planet Came to Life. The book explores all the ways life has shaped our physical world and, in doing so, inevitably revisits the question “Is the Earth alive?”

Lovelock and Margulis called the idea “the Gaia Hypothesis” — named after the ancient Greek goddess of the Earth. It was openly mocked by many in mainstream Western science. “For many decades, the Gaia hypothesis was considered kind of this fringe sort of woo-woo idea,” Jabr says. “Because for biologists,” Jabr says, life is a specific thing. “It is typically thought of as an organism that is a product of Darwinian evolution by natural selection. And Earth as a planet does not meet those criteria.”

It didn’t help that the original articulation of Gaia granted Earth a certain degree of sentience. The hypothesis argued “all of the living organisms on Earth are collaborating to deliberately create a climate that is suitable for life,” as Jabr says. But yet, this idea has persisted, for a few reasons. Scientists have never been able to precisely define what life is. So, it’s been hard to dismiss Gaia completely.

The Gaia hypothesis has also evolved over the years. Later iterations deemphasized that life was “collaborating” to transform the Earth, Jabr explains. Which still leaves a lot to be explored: Certainly living things don’t need to be thought of as conscious, or have agency, to be considered alive. Consider the clam, which lacks a central nervous system.

Jabr found in the years since Gaia was first introduced, scientists have uncovered more connections between biology, ecology, and geology, which make the boundaries between these disciplines appear even more fuzzy. The Amazon rainforest essentially “summons” its own rain, as Jabr explains in his book. They learned how life is involved in the process that generated the continents. Life plays a role in regulating Earth’s temperature. They’ve learned that just about everywhere you look on Earth, you find life influencing the physical properties of our planet.

In reporting his book, Jabr comes to the conclusion that not only is the Earth indeed a living creature, but thinking about it in such a way might help inspire action in dealing with the climate crisis.

Brian Resnick spoke to Jabr for an episode of Unexplainable, Vox’s podcast that explores scientific mysteries, unanswered questions, and all the things we learn by diving into the unknown. You can listen to the full conversation here. This interview has been edited for length and clarity.

Brian Resnick

Do you think the Earth is alive?

Ferris Jabr

I do. I think Earth is alive. We can think of Earth as a genuine living entity, in a meaningful sense, and in a scientific sense. There are four parts to the argument that substantiate that statement.

Brian Resnick

What’s the first?

Ferris Jabr

Life isn’t just on Earth. It literally came out of Earth. It is literally part of Earth. It is Earth. All of the matter that we refer to as life is Earth animated — that’s how I come to think about it. If you accept that, then at a bare minimum, you have to accept as a scientific fact that the surface of the planet is genuinely alive, because it is matter that has become animated.

Brian Resnick

Earth animated? What do you mean by that?

Ferris Jabr

Every single living organism is literally made of Earth. All of its constituent elements and components are parts of the planet. We all come from the planet. We all return to the planet. It’s just a big cycle. And so life, the biological matter on the planet, is literally the matter of the planet, animated. It is living matter.

Imagine a vast beach and sandcastles and other sculptures spontaneously emerge from the sand. They are still made of sand, right? They’re not suddenly divorced from the beach just because they’ve arisen from the beach. Those castles and sculptures are still literally the beach. And I think it’s the same with life and Earth.

Brian Resnick

So, the physical components of Earth are the material of life. And so distinguishing these two — Earth and life — seems silly because they comprise each other?

Ferris Jabr

The more you think about this, the more the boundaries dissolve.

Every layer of the planet that we’ve been able to access, we find life there. And in the deepest mines that we have dug, we continue to find microbes and sometimes even more complex organisms like nematodes, these tiny, worm-like creatures.

Brian Resnick

So all life contains Earth, and Earth contains life?

Ferris Jabr

There are components of the Earth that are not alive in any way. The center of the planet, it’s all molten rock and there might be some solid metal in the core.

But think about a redwood tree: It is mostly dead wood in terms of its volume and mass. It is mostly nonliving tissue. And then a little bit of tissue that is laced with living cells. So, you know, most complex multicellular living entities are a jumble of the animate and inanimate. Earth is not unusual in that way.

Brian Resnick

What is part two of your argument?

Ferris Jabr

All these organisms [on Earth], they give Earth a kind of anatomy and physiology. Life dramatically increases the planet’s capacity to absorb, store, and transform energy, to exchange gases, and to perform complex chemical reactions.

Brian Resnick

What’s a good example of this?

Ferris Jabr

You can think of all of the photosynthetic life on the planet acting in concert. It’s not that they’re deliberately collaborating to do something, but they’re all doing their own thing at the same time.

NASA has made these amazing videos and animations and they’ve literally called them “Earth breathing,” because you can see how the levels of carbon dioxide and oxygen in the atmosphere fluctuate with the seasons. The amount of vegetation that rings the continents, especially in the Northern Hemisphere, in the mid-latitudes, it changes dramatically with the seasons. It has a sinuous rhythm. It looks like a pulse or like breathing.

Brian Resnick

So, are you saying something like all of the algae or plankton in the ocean are generating this together? … Is that kind of like how all of the cells in my lungs are working together to exchange gases? Or is that not quite the right way to think about it?

Ferris Jabr

I think we have to be careful with making too direct a comparison. You as an organism are a product of evolution by natural selection. Your structure, your anatomy is something that was written into your genome. That’s not how the Earth system formed.

Brian Resnick

I’m realizing a key to this conversation is what you just corrected me on. When we’re discussing this notion about the “Earth being alive,” we’re not suggesting it’s not alive in the same way you and I are. But there’s these equivalent processes that look very similar to the way my body maintains homeostasis, for example. It’s not like the Earth is exchanging gases and doing metabolism-like things in the way I’ve been evolved to. It’s not achieving homeostasis the way you or I do. But yet it is doing something that seems analogous. Is that the kind of thing that you’re arguing here, overall?

Ferris Jabr

Absolutely.

When we’re looking at the planet, we see life-like qualities, things that resemble the characteristics of the organism, which is the most familiar life form to us. But it is not exactly the same. It is still genuinely alive, in my opinion, but is not exactly an organism.

Life is a phenomenon that occurs at multiple scales. The way I think of it is that it’s not identical at all of those scales, but it rhymes and there are analogies between each of those scales.

I like to think of a leaf on a tree in a forest on a planet.

There’s no disagreement whatsoever within science that the cells that compose that leaf are alive. The tissues that those cells form are alive. The leaf as a whole is a living tissue. The tree we consider an organism that is also alive. We consider each of those layers to be alive. There’s no debate or controversy about that.

Once we go above the scale of the organism, this is where the debate begins. Can we think of the forest, the ecosystem, as alive as well? And then one more level higher. Can we think of the planet as alive?

My argument is, yes, that each of those levels, each of those scales is equally alive but not identical. And there are analogous processes that happen at each. But they’re not exactly the same.

Brian Resnick

What is the next plank of your argument?

Ferris Jabr

Life is also an engine of planetary evolution. The planet evolves over time dramatically. It is not exactly the same as standard Darwinian evolution through natural selection, but it is very much a type of evolution.

Organisms and their environments continually co-evolve. Each is profoundly changing the other.

This reciprocal transformation is responsible for many of the planet’s defining features: for our breathable atmosphere, our blue sky, our bountiful oceans, our fertile soils. This is all because of life and because of the way that life has changed the planetary environments. These are not default features of the planet. Life has created them over time.

Brian Resnick

What is the most stunning example of how life has actually changed the planet?

Ferris Jabr

In the beginning, Earth had essentially no free oxygen in its atmosphere, and the sky was probably a hazy orange. And when cyanobacteria began to oxygenate the atmosphere through the innovation of photosynthesis, the sky probably started shifting toward the blue part of the spectrum.

The entire chemistry of the planet changed. I mean, you suddenly had an oxygen-rich environment, whereas before it was an oxygen-poor environment. That changes absolutely everything.

Brian Resnick

Okay, so to get back to what you were saying before, it’s not that Earth evolves in the same way that organisms evolve. But it evolves with a different mechanism, is that right?

Ferris Jabr

Evolutionary biologists will say a planet cannot evolve because it doesn’t have a cohesive genome. There’s no genetic inheritance going on; there’s no sexual reproduction going on.

But there are analogous processes by which changes are passed down from generation to generation that are not genetically encoded.

If we think about a bunch of large mammals, they’re transforming their landscape by walking through it with their immense hefts. They’re tearing down vegetation. They’re digging in, uprooting things. They’re changing the landscape.

Those changes persist. And so their descendants now are evolving in a new environment changed by their predecessors. These environmental changes are not themselves genetically encoded, but they are being passed from generation to generation, and they are inevitably influencing the evolution that follows.

Brian Resnick

If a fundamental part of life is that it changes the world in which it exists, how are we different for accelerating the climate crisis? Because you look at the history of the Earth and you say, well, life has powerfully changed it. Who’s to say what we’re doing is necessarily not a natural process?

Ferris Jabr

It’s simultaneously humbling and empowering to recognize ourselves as simply the latest chapter in this long evolutionary saga of life changing the planet. It is a basic property of life to change its environment, and we’re not an exception to that.

But I do think there’s a major distinction between what our species has done and what has happened before in terms of the combined scale and speed and the variety of our changes to the planet. I don’t think there’s any species or creature before us that has changed the planet on such a large scale so quickly and in so many different ways simultaneously.

We have radically altered the atmosphere, the oceans, and the continents. We’ve done it in a couple of centuries. That’s a huge part of the reason for why the crisis we’re going through right now is a crisis. It has so much to do with the scale and the speed of it.

Brian Resnick

What’s part four of your argument?

Ferris Jabr

This co-evolution, on the whole, has amplified the planet’s capacity for self-regulation and enhanced Earth’s resilience. Earth has remained alive for, you know, around 4 billion years, despite repeated catastrophes of unfathomable scale, unlike anything that we have ever experienced in human history. We have to account for that resilience, for that incredible persistence through time.

It is not a deliberate thing. You know, it is not a conscious or collaborative thing. It is simply an inevitable physical process, just as evolution by natural selection is an inevitable physical process.

Even in the mass extinctions in Earth’s history, life recedes to its most fundamental and most resilient forms: microbes. And then life sprouts from there.

Brian Resnick

Are you sure you’re right about all this? Is the scientific community coming around to accept this notion that Earth is indeed alive?

Ferris Jabr

I mean, this book is my personal synthesis, an argument. You know, this is my viewpoint. This is how I have come to see the Earth. There are scientists who agree with me, but I would not say that this is the consensus of modern mainstream science. I think the statement that Earth is alive remains quite controversial and provocative. However, everything else we’ve been talking about, the co-evolution of life and environment, the fact that life has profoundly changed the planet. These are all well-accepted points.

Brian Resnick

Which part are you most likely wrong about? Or which part do you feel like has the most room for doubt?

Ferris Jabr

We do not have a precise, universally accepted definition of life. We haven’t explained it on the most fundamental level. Like 100 years from now, will we have a fundamental explanation for life that we’re missing right now? And if we do, will that make thinking of planets as alive defunct? And so, I think open-mindedness is fundamental to any scientific thinking or scientific process. And we have to be open to the idea that a century from now, or even sooner, all of this will be wrong.

And that’s part of what I find thrilling: We don’t have all of the answers yet. Right? These are incredibly challenging ideas and concepts that we are still working out. If we had figured it out, then we wouldn’t be talking about the Gaia hypothesis anymore. The Gaia would have been officially dead a long time ago. But I think the reason that it remains relevant and continues to be debated means that we just haven’t figured it out yet.

Brian Resnick

Why is it useful to think of the Earth as alive?

Ferris Jabr

There’s a massive difference between thinking of ourselves as living creatures that simply reside on a planet, that simply inhabit a planet, versus being a component of a much larger living entity. When we properly understand our role within the living Earth system, I think the moral urgency of the climate crisis really comes into focus.

All of a sudden it’s not just that, oh, the bad humans have harmed the environment and we need to do something about it. It’s that each of us is literally Earth animated, and we are one part of this much larger, living entity. It’s a realization that everything that we are all doing moment to moment, day to day, is affecting this larger living entity in some way.

Brian Resnick

So, the simple point that you’re making is that we are Earth, and don’t self-harm.

Ferris Jabr

Right, exactly.

Read the full story here.
Photos courtesy of

This moss survived in space for 9 months

In an experiment on the outside of the International Space Station, a species of moss survived in space for 9 months. And it could have lasted much longer. The post This moss survived in space for 9 months first appeared on EarthSky.

Meet a spreading earthmoss known as Physcomitrella patens. It’s frequently used as a model organism for studies on plant evolution, development, and physiology. In this image, a reddish-brown sporophyte sits at the top center of a leafy gametophore. This capsule contains numerous spores inside. Scientists tested samples like these on the outside of the International Space Station (ISS) to see if they could tolerate the extreme airless environment. And they did. The moss survived in space for 9 months and could have lasted even longer. Image via Tomomichi Fujita/ EurekAlert! (CC BY-SA). Space is a deadly environment, with no air, extreme temperature swings and harsh radiation. Could any life survive there? Reasearchers in Japan tested a type of moss called spreading earthmoss on the exterior of the International Space Station. The moss survived for nine months, and the spores were still able to reproduce when brought back to Earth. Moss survived in space for 9 months Can life exist in space? Not simply on other planets or moons, but in the cold, dark, airless void of space itself? Most organisms would perish almost immediately, to be sure. But researchers in Japan recently experimented with moss, with surprising results. They said on November 20, 2025, that more than 80% of their moss spores survived nine months on the outside of the International Space Station. Not only that, but when brought back to Earth, they were still capable of reproducing. Nature, it seems, is even tougher than we thought! Amazingly, the results show that some primitive plants – not even just microorganisms – can survive long-term exposure to the extreme space environment. The researchers published their peer-reviewed findings in the journal iScience on November 20, 2025. A deadly environment for life Space is a horrible place for life. The lack of air, radiation and extreme cold make it pretty much unsurvivable for life as we know it. As lead author Tomomichi Fujita at Hokkaido University in Japan stated: Most living organisms, including humans, cannot survive even briefly in the vacuum of space. However, the moss spores retained their vitality after nine months of direct exposure. This provides striking evidence that the life that has evolved on Earth possesses, at the cellular level, intrinsic mechanisms to endure the conditions of space. This #moss survived 9 months directly exposed to the vacuum space and could still reproduce after returning to Earth. ? ? spkl.io/63322AdFrpTomomichi Fujita & colleagues@cp-iscience.bsky.social — Cell Press (@cellpress.bsky.social) 2025-11-24T16:00:02.992Z What about moss? Researchers wanted to see if any Earthly life could survive in space’s deadly environment for the long term. To find out, they decided to do some experiments with a type of moss called spreading earthmoss, or Physcomitrium patens. The researchers sent hundreds of sporophytes – encapsulated moss spores – to the International Space Station in March 2022, aboard the Cygnus NG-17 spacecraft. They attached the sporophyte samples to the outside of the ISS, where they were exposed to the vacuum of space for 283 days. By doing so, the samples were subjected to high levels of UV (ultraviolet) radiation and extreme swings of temperature. The samples later returned to Earth in January 2023. The researchers tested three parts of the moss. These were the protonemata, or juvenile moss; brood cells, or specialized stem cells that emerge under stress conditions; and the sporophytes. Fujita said: We anticipated that the combined stresses of space, including vacuum, cosmic radiation, extreme temperature fluctuations and microgravity, would cause far greater damage than any single stress alone. Astronauts placed the moss samples on the outside of the International Space Station for the 9-month-long experiment. Incredibly, more than 80% of the the encapsulated spores survived the trip to space and back to Earth. Image via NASA/ Roscosmos. The moss survived! So, how did the moss do? The results were mixed, but overall showed that the moss could survive in space. The radiation was the most difficult aspect of the space environment to withstand. The sporophytes were the most resilient. Incredibly, they were able to survive and germinate after being exposed to -196 degrees Celsius (-320 degrees Fahrenheit) for more than a week. At the other extreme, they also survived in 55° degrees C (131 degrees F) heat for a month. Some brood cells survived as well, but the encased spores were about 1,000 times more tolerant to the UV radiation. On the other hand, none of the juvenile moss survived the high UV levels or the extreme temperatures. Samples of moss spores that germinated after their 9-month exposure to space. Image via Dr. Chang-hyun Maeng/ Maika Kobayashi/ EurekAlert!. (CC BY-SA). How did the spores survive? So why did the encapsulated spores do so well? The researchers said the natural structure surrounding the spore itself helps to protect the spore. Essentially, it absorbs the UV radiation and surrounds the inner spore both physically and chemically to prevent damage. As it turns out, this might be associated with the evolution of mosses. This is an adaptation that helped bryophytes – the group of plants to which mosses belong – to make the transition from aquatic to terrestrial plants 500 million years ago. Overall, more than 80% of the spores survived the journey to space and then back to Earth. And only 11% were unable to germinate after being brought back to the lab on Earth. That’s impressive! In addition, the researchers also tested the levels of chlorophyll in the spores. After the exposure to space, the spores still had normal amounts of chlorophyll, except for chlorophyll a specifically. In that case, there was a 20% reduction. Chlorophyll a is used in oxygenic photosynthesis. It absorbs the most energy from wavelengths of violet-blue and orange-red light. Tomomichi Fujita at Hokkaido University in Japan is the lead author of the new study about moss in space. Image via Hokkaido University. Spores could have survived for 15 years The time available for the experiment was limited to the several months. However, the researchers wondered if the moss spores could have survived even longer. And using mathematical models, they determined the spores would likely have continued to live in space for about 15 years, or 5,600 days, altogether. The researchers note this prediction is a rough estimate. More data would still be needed to make that assessment even more accurate. So the results show just how resilient moss is, and perhaps some other kinds of life, too. Fujita said: This study demonstrates the astonishing resilience of life that originated on Earth. Ultimately, we hope this work opens a new frontier toward constructing ecosystems in extraterrestrial environments such as the moon and Mars. I hope that our moss research will serve as a starting point. Bottom line: In an experiment on the outside of the International Space Station, a species of moss survived in space for nine months. And it could have lasted much longer. Source: Extreme environmental tolerance and space survivability of the moss, Physcomitrium patens Via EurekAlert! Read more: This desert moss could grow on Mars, no greenhouse needed Read more: Colorful life on exoplanets might be lurking in cloudsThe post This moss survived in space for 9 months first appeared on EarthSky.

Medical Imaging Contributing To Water Pollution, Experts Say

By Dennis Thompson HealthDay ReporterTHURSDAY, Dec. 11, 2025 (HealthDay News) — Contrast chemicals injected into people for medical imaging scans...

By Dennis Thompson HealthDay ReporterTHURSDAY, Dec. 11, 2025 (HealthDay News) — Contrast chemicals injected into people for medical imaging scans are likely contributing to water pollution, a new study says.Medicare patients alone received 13.5 billion milliliters of contrast media between 2011 and 2024, and those chemicals wound up in waterways after people excreted them, researchers recently reported in JAMA Network Open.“Contrast agents are necessary for effective imaging, but they don’t disappear after use,” said lead researcher Dr. Florence Doo, an assistant professor at the University of Maryland Medical Intelligent Imaging Center in Baltimore.“Iodine and gadolinium are non-renewable resources that can enter wastewater and accumulate in rivers, oceans and even drinking water,” Doo said in a news release.People undergoing X-ray or CT scans are sometimes given iodine or barium-sulfate compounds that cause certain tissues, blood vessels or organs to light up, allowing radiologists a better look at potential health problems.For MRI scans, radiologists use gadolinium, a substance that alters the magnetic properties of water molecules in the human body.These are critical for diagnosing disease, but they are also persistent pollutants, researchers said in background notes. They aren’t biodegradable, and conventional wastewater treatment doesn’t fully remove them.For the new study, researchers analyzed 169 million contrast-enhanced imaging procedures that Medicare covered over 13 years.Iodine-based contrast agents accounted for more than 95% of the total volume, or nearly 12.9 billion milliliters. Of those, agents used in CT scans of the abdomen and pelvis alone contributed 4.4 billion milliliters.Gadolinium agents were less frequently used, but still contributed nearly 600 million milliliters, researchers said. Brain MRIs were the most common scan using these contrast materials.Overall, just a handful of procedures accounted for 80% of all contrast use, researchers concluded.“Our study shows that a small number of imaging procedures drive the majority of contrast use. Focusing on those highest-use imaging types make meaningful changes tractable and could significantly reduce health care’s environmental footprint,” researcher Elizabeth Rula, executive director of the Harvey L. Neiman Health Policy Institute in Reston, Va., said in a news release.Doctors can help by making sure their imaging orders are necessary, while radiologists can lower the doses of contrast agents by basing them on a patient’s weight, researchers said.Biodegradable contrast media are under development, researchers noted. Another solution could involve AI, which might be able to accurately analyze medical imaging scans even if less contrast media is used.“We can’t ignore the environmental consequences of medical imaging,” Doo said. “Stewardship of contrast agents is a measurable and impactful way to align patient care with planetary health and should be an important part of broader health care sustainability efforts.”SOURCES: Harvey L. Neiman Health Policy Institute, news release, Dec. 4, 2025; JAMA Network Open, Dec. 5, 2025Copyright © 2025 HealthDay. All rights reserved.

Cars to AI: How new tech drives demand for specialized materials

Generative artificial intelligence has become widely accepted as a tool that increases productivity. Yet the technology is far from mature. Large language models advance rapidly from one generation to the next, and experts can only speculate how AI will affect the workforce and people’s daily lives. As a materials scientist, I am interested in how materials and the technologies that derive from them affect society. AI is one example of a technology driving global change—particularly through its demand for materials and rare minerals. But before AI evolved to its current level, two other technologies exemplified the process created by the demand for specialized materials: cars and smartphones. Often, the mass adoption of a new invention changes human behavior, which leads to new technologies and infrastructures reliant upon the invention. In turn, these new technologies and infrastructures require new or improved materials—and these often contain critical minerals: those minerals that are both essential to the technology and strain the supply chain. The unequal distribution of these minerals gives leverage to the nations that produce them. The resulting power shifts strain geopolitical relations and drive the search for new mineral sources. New technology nurtures the mining industry. The car and the development of suburbs At the beginning of the 20th century, only 5 out of 1,000 people owned a car, with annual production around a few thousand. Workers commuted on foot or by tram. Within a 2-mile radius, many people had all they needed: from groceries to hardware, from school to church, and from shoemakers to doctors. Then, in 1913, Henry Ford transformed the industry by inventing the assembly line. Now, a middle class family could afford a car: Mass production cut the price of the Model T from US$850 in 1908 to $360 in 1916. While the Great Depression dampened the broad adoption of the car, sales began to increase again after the end of World War II. With cars came more mobility, and many people moved farther away from work. In the 1940s and 1950s, a powerful highway lobby that included oil, automobile, and construction interests promoted federal highway and transportation policies, which increased automobile dependence. These policies helped change the landscape: Houses were spaced farther apart, and located farther away from the urban centers where many people worked. By the 1960s, two-thirds of American workers commuted by car, and the average commute had increased to 10 miles. Public policy and investment favored suburbs, which meant less investment in city centers. The resulting decay made living in downtown areas of many cities undesirable and triggered urban renewal projects. Long commutes added to pollution and expenses, which created a demand for lighter, more fuel-efficient cars. But building these required better materials. In 1970, the entire frame and body of a car was made from one steel type, but by 2017, 10 different, highly specialized steels constituted a vehicle’s lightweight form. Each steel contains different chemical elements, such as molybdenum and vanadium, which are mined only in a few countries. While the car supply chain was mostly domestic until the 1970s, the car industry today relies heavily on imports. This dependence has created tension with international trade partners, as reflected by higher tariffs on steel. The cellphone and American life The cellphone presents another example of a technology creating a demand for minerals and affecting foreign policy. In 1983, Motorola released the DynaTAC, the first commercial cellular phone. It was heavy, expensive, and its battery lasted for only half an hour, so few people had one. Then in 1996, Motorola introduced the flip phone, which was cheaper, lighter, and more convenient to use. The flip phone initiated the mass adoption of cellphones. However, it was still just a phone: Unlike today’s smartphones, all it did was send and receive calls and texts. In 2007, Apple redefined communication with the iPhone, inventing the touchscreen and integrating an internet navigator. The phone became a digital hub for navigating, finding information, and building an online social identity. Before smartphones, mobile phones supplemented daily life. Now, they structure it. In 2000, fewer than half of American adults owned a cellphone, and nearly all who did used it only sporadically. In 2024, 98% of Americans over the age of 18 reported owning a cellphone, and over 90% owned a smartphone. Without the smartphone, most people cannot fulfill their daily tasks. Many individuals now experience nomophobia: They feel anxious without a cellphone. Around three-quarters of all stable elements are represented in the components of each smartphone. These elements are necessary for highly specialized materials that enable touchscreens, displays, batteries, speakers, microphones, and cameras. Many of these elements are essential for at least one function and have an unreliable supply chain, which makes them critical. Critical materials and AI Critical materials give leverage to countries that have a monopoly in mining and processing them. For example, China has gained increased power through its monopoly on rare earth elements. In April 2025, in response to U.S. tariffs, China stopped exporting rare earth magnets, which are used in cellphones. The geopolitical tensions that resulted demonstrate the power embodied in the control over critical minerals. The mass adoption of AI technology will likely change human behavior and bring forth new technologies, industries, and infrastructure on which the U.S. economy will depend. All of these technologies will require more optimized and specialized materials and create new material dependencies. By exacerbating material dependencies, AI could affect geopolitical relations and reorganize global power. America has rich deposits of many important minerals, but extraction of these minerals comes with challenges. Factors including slow and costly permitting, public opposition, environmental concerns, high investment costs, and an inadequate workforce all can prevent mining companies from accessing these resources. The mass adoption of AI is already adding pressure to overcome these factors and to increase responsible domestic mining. While the path from innovation to material dependence spanned a century for cars and a couple of decades for cellphones, the rapid advancement of large language models suggests that the scale will be measured in years for AI. The heat is already on. Peter Müllner is a distinguished professor in materials science and engineering at Boise State University. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Generative artificial intelligence has become widely accepted as a tool that increases productivity. Yet the technology is far from mature. Large language models advance rapidly from one generation to the next, and experts can only speculate how AI will affect the workforce and people’s daily lives. As a materials scientist, I am interested in how materials and the technologies that derive from them affect society. AI is one example of a technology driving global change—particularly through its demand for materials and rare minerals. But before AI evolved to its current level, two other technologies exemplified the process created by the demand for specialized materials: cars and smartphones. Often, the mass adoption of a new invention changes human behavior, which leads to new technologies and infrastructures reliant upon the invention. In turn, these new technologies and infrastructures require new or improved materials—and these often contain critical minerals: those minerals that are both essential to the technology and strain the supply chain. The unequal distribution of these minerals gives leverage to the nations that produce them. The resulting power shifts strain geopolitical relations and drive the search for new mineral sources. New technology nurtures the mining industry. The car and the development of suburbs At the beginning of the 20th century, only 5 out of 1,000 people owned a car, with annual production around a few thousand. Workers commuted on foot or by tram. Within a 2-mile radius, many people had all they needed: from groceries to hardware, from school to church, and from shoemakers to doctors. Then, in 1913, Henry Ford transformed the industry by inventing the assembly line. Now, a middle class family could afford a car: Mass production cut the price of the Model T from US$850 in 1908 to $360 in 1916. While the Great Depression dampened the broad adoption of the car, sales began to increase again after the end of World War II. With cars came more mobility, and many people moved farther away from work. In the 1940s and 1950s, a powerful highway lobby that included oil, automobile, and construction interests promoted federal highway and transportation policies, which increased automobile dependence. These policies helped change the landscape: Houses were spaced farther apart, and located farther away from the urban centers where many people worked. By the 1960s, two-thirds of American workers commuted by car, and the average commute had increased to 10 miles. Public policy and investment favored suburbs, which meant less investment in city centers. The resulting decay made living in downtown areas of many cities undesirable and triggered urban renewal projects. Long commutes added to pollution and expenses, which created a demand for lighter, more fuel-efficient cars. But building these required better materials. In 1970, the entire frame and body of a car was made from one steel type, but by 2017, 10 different, highly specialized steels constituted a vehicle’s lightweight form. Each steel contains different chemical elements, such as molybdenum and vanadium, which are mined only in a few countries. While the car supply chain was mostly domestic until the 1970s, the car industry today relies heavily on imports. This dependence has created tension with international trade partners, as reflected by higher tariffs on steel. The cellphone and American life The cellphone presents another example of a technology creating a demand for minerals and affecting foreign policy. In 1983, Motorola released the DynaTAC, the first commercial cellular phone. It was heavy, expensive, and its battery lasted for only half an hour, so few people had one. Then in 1996, Motorola introduced the flip phone, which was cheaper, lighter, and more convenient to use. The flip phone initiated the mass adoption of cellphones. However, it was still just a phone: Unlike today’s smartphones, all it did was send and receive calls and texts. In 2007, Apple redefined communication with the iPhone, inventing the touchscreen and integrating an internet navigator. The phone became a digital hub for navigating, finding information, and building an online social identity. Before smartphones, mobile phones supplemented daily life. Now, they structure it. In 2000, fewer than half of American adults owned a cellphone, and nearly all who did used it only sporadically. In 2024, 98% of Americans over the age of 18 reported owning a cellphone, and over 90% owned a smartphone. Without the smartphone, most people cannot fulfill their daily tasks. Many individuals now experience nomophobia: They feel anxious without a cellphone. Around three-quarters of all stable elements are represented in the components of each smartphone. These elements are necessary for highly specialized materials that enable touchscreens, displays, batteries, speakers, microphones, and cameras. Many of these elements are essential for at least one function and have an unreliable supply chain, which makes them critical. Critical materials and AI Critical materials give leverage to countries that have a monopoly in mining and processing them. For example, China has gained increased power through its monopoly on rare earth elements. In April 2025, in response to U.S. tariffs, China stopped exporting rare earth magnets, which are used in cellphones. The geopolitical tensions that resulted demonstrate the power embodied in the control over critical minerals. The mass adoption of AI technology will likely change human behavior and bring forth new technologies, industries, and infrastructure on which the U.S. economy will depend. All of these technologies will require more optimized and specialized materials and create new material dependencies. By exacerbating material dependencies, AI could affect geopolitical relations and reorganize global power. America has rich deposits of many important minerals, but extraction of these minerals comes with challenges. Factors including slow and costly permitting, public opposition, environmental concerns, high investment costs, and an inadequate workforce all can prevent mining companies from accessing these resources. The mass adoption of AI is already adding pressure to overcome these factors and to increase responsible domestic mining. While the path from innovation to material dependence spanned a century for cars and a couple of decades for cellphones, the rapid advancement of large language models suggests that the scale will be measured in years for AI. The heat is already on. Peter Müllner is a distinguished professor in materials science and engineering at Boise State University. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Synthetic chemicals in food system creating health burden of $2.2tn a year, report finds

Scientists issue urgent warning about chemicals, found to cause cancer and infertility as well as harming environmentScientists have issued an urgent warning that some of the synthetic chemicals that help underpin the current food system are driving increased rates of cancer, neurodevelopmental conditions and infertility, while degrading the foundations of global agriculture.The health burden from phthalates, bisphenols, pesticides and Pfas “forever chemicals” amounts to up to $2.2tn a year – roughly as much as the profits of the world’s 100 largest publicly listed companies, according to the report published on Wednesday. Continue reading...

Scientists have issued an urgent warning that some of the synthetic chemicals that help underpin the current food system are driving increased rates of cancer, neurodevelopmental conditions and infertility, while degrading the foundations of global agriculture.The health burden from phthalates, bisphenols, pesticides and Pfas “forever chemicals” amounts to up to $2.2tn a year – roughly as much as the profits of the world’s 100 largest publicly listed companies, according to the report published on Wednesday.Most ecosystem damage remains unpriced, they say, but even a narrow accounting of ecological impacts, taking into account agricultural losses and meeting water safety standards for Pfas and pesticides, implies a further cost of $640bn. There are also potential consequences for human demographics, with the report concluding that if exposure to endocrine disruptors such as bisphenols and phthalates persists at current rates, there could be between 200 million and 700 million fewer births between 2025 and 2100.The report is the work of dozens of scientists from organisations including the Institute of Preventive Health, the Center for Environmental Health, Chemsec, and various universities in the US and UK, including the University of Sussex and Duke University. It was led by a core team from Systemiq, a company that invests in enterprises aimed at fulfilling the UN sustainable development goals and the Paris agreement on climate change.The authors said they had focused on the four chemical types examined because “they are among the most prevalent and best studied worldwide, with robust evidence of harm to human and ecological health”.One of the team, Philip Landrigan, a paediatrician and professor of global public health at Boston College, called the report a “wake-up call”. He said: “The world really has to wake up and do something about chemical pollution. I would argue that the problem of chemical pollution is every bit as serious as the problem with climate change.”Human and ecosystem exposure to synthetic chemicals has surged since the end of the second world war, with chemical production increasing by more than 200 times since the 1950s and more than 350,000 synthetic chemicals currently on the global market.Three years ago, researchers from the Stockholm Resilience Centre (SRC) concluded that chemical pollution had crossed a “planetary boundary”, the point at which human-made changes to the Earth push it outside the stable environment of the past 10,000 years, the period in which modern human civilisation has developed.Unlike with pharmaceuticals, there are few safeguards to test for the safety of industrial chemicals before they are put into use, and little monitoring of their effects once they are. Some have been found to be disastrously toxic to humans, animals and ecosystems, leaving governments to pick up the bill.This report assesses the impact of four families of synthetic chemicals endemic in global food production. Phthalates and bisphenols are commonly used as plastic additives, employed in food packaging and disposable gloves used in food preparation.Pesticides underpin industrial agriculture, with large-scale monoculture farms spraying thousands of gallons on crops to eliminate weeds and insects, and many crops treated after harvest to maintain freshness.Pfas are used in food contact materials such as greaseproof paper, popcorn tubs and ice-cream cartons, but have also accumulated in the environment to such an extent they enter food via air, soil and water contamination.All have been linked to harms including endocrine (hormone system) disruption, cancers, birth defects, intellectual impairment and obesity.Landrigan said that during his long career in paediatric public health he had seen a shift in the conditions affecting children. “The amount of disease and death caused by infectious diseases like measles, like scarlet fever, like pertussis, has come way down,” he said. “By contrast, there’s been this incredible increase in rates of non-communicable diseases. And of course, there’s no single factor there … but the evidence is very clear that increasing exposure to hundreds, maybe even thousands of manufactured chemicals is a very important cause of disease in kids.”Landrigan said he was most concerned about “the chemicals that damage children’s developing brains and thus make them less intelligent, less creative, just less able to give back to society across the whole of their lifetimes”.“And the second class of chemicals that I worry really worried about are the endocrine-disrupting chemicals,” he added. “Bisphenol would be the classic example, that get into people’s bodies at every age, damage the liver, change cholesterol metabolism, and result in increased serum cholesterol, increased obesity, increased diabetes, and those internally to increase rates of heart disease and stroke.”Asked whether the report could have looked beyond the groups of chemicals studied, Landridge said: “I would argue that they’re only the tip of the iceberg. They’re among the very small number of chemicals, maybe 20 or 30 chemicals where we really have solid toxicologic information.“What scares the hell out of me is the thousands of chemicals to which we’re all exposed every day about which we know nothing. And until one of them causes something obvious, like children to be born with missing limbs, we’re going to go on mindlessly exposing ourselves.”

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