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Scorching schoolyards: California groups want more trees, less asphalt at schools

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Tuesday, May 21, 2024

In summary Too few trees at California’s schools mean there’s little protecting students from a warming planet. Here’s how advocates say the state can pay for more shade. Schoolyards are hot and getting hotter, but only a tiny fraction of California’s grade school students can play in the shade. Researchers and advocates are pushing the state to allocate money for green schoolyards, which can include trees, grass or gardens in place of the flat asphalt or rubber play surfaces at most schools.  With the help of more than $121 million in state grants, 164 schools already are on their way to either designing or building green schoolyards. Many more applied for the school greening grants, with requests totaling more than $350 million for projects they hoped to build. The high applicant numbers highlight growing demand for greenery at schools as the climate gets hotter. But with California’s Green Schoolyards program depleted and a state general budget deficit of $56 billion over the next two fiscal years, where will the money for green school projects come from?  Some environmental groups are pushing for a proposed climate bond that would include $350 million for the green schoolyards program. They also are pushing for a $1 billion carve-out in a proposed $14-$15 billion school infrastructure bond that could go before voters this November. Students from International Community Elementary and Think College Now Elementary play during recess in Oakland on April 29, 2024. Advocates say millions of children lack outdoor shade at California’s public schools. Photo by Laure Andrillon for CalMatters “It is well known that our K-12 schoolyards, play structures and campuses are among the most dangerous climate liabilities currently facing the state — principally due to the deadly heat and flood potential our kids are being exposed to now,” environment groups wrote in a letter to authors of two school infrastructure bond proposals, Assemblymember Al Muratsuchi, a Democrat from Torrance, and state Sen. Steve Glazer, a Democrat from Orinda. Muratsuchi told CalMatters he is reluctant to dictate how schools should use bond money.  “I’m aware of their request, but we have many other requests to consider,” he said, such as funds for heating and air conditioning systems and solar energy on campuses. “But those priorities will be defined by local school districts.” Learn more about legislators mentioned in this story. Steven Glazer Democrat, State Senate, District 7 (Orinda) Al Muratsuchi Democrat, State Assembly, District 66 (Torrance) Students need outdoor shade On a typical 90-degree day under full sun, grass can reach 95 degrees, while asphalt can hit 150  and rubber surfaced play areas can reach 165 degrees, according to research by the UCLA Luskin Center for Innovation.  Forget 90 degrees; other research predicts much of the country is on track for more than double the usual number of 100-degree days by midcentury. Fresno already averages 33 days of 100+ degrees each year, Sacramento has 19 and Riverside has 14, federal weather data shows.  Unrelenting sun and high heat are bad for kids, the Luskin Center says: “Playing outside in the heat can lead to dehydration, headaches, heat stroke and other health impacts.”  Shade from trees is one of the best ways to cool things down, the researchers said, because it can reduce heat exposure to children by as much as 70 degrees.  But most of California’s schools lack tree canopy, and the trees that do exist on campuses are often around the perimeter, where students can’t access their shade during recess.  Green Schoolyards America, a nonprofit dedicated to building more green space on campuses, recently conducted a study of the tree canopy shading the state’s more than 10,000 public schools.  It found that an average of 6.4% of the school areas students access are covered by tree shade. More than 2.5 million students attend schools with less than 5% tree canopy in student areas. That’s a far cry from what urban forestry and climate experts recommend. They say there needs to be enough trees to cover 30% of every city. Driven by that goal, Green Schoolyards America is pushing for ways to plant trees to cover at least 30% of each school area used by children during the day.  So far only 29,452 California students have that level of tree canopy, out of nearly 6 million students.  The schoolyard at the César E. Chávez Education Center in Oakland, prior to the creation of a ‘living schoolyard’. Advocates say most of California’s public schools lack trees or other outdoor shade sources, leaving millions of students vulnerable to heat and sun. Photo by Angela DeCenzo, Trust For Public Land “This is a long-term infrastructure problem,” said Sharon Gamson Danks, chief executive of Green Schoolyards America.   “It’s not building a little garden in the corner. It’s actual infrastructure, on par with highway building. It’s an investment, and we want children to not be overlooked in preparing for climate and protecting their health.” Most greening projects on school campuses include more trees, but they can also include mulch, grassy fields to replace asphalt, and wooden play and learning structures, said Šárka Volejníková, the Trust for Public Land’s program director for Bay Area parks.  The difference green space makes At the César E. Chávez Education Center in Oakland, students — many from low income families — used to play on a yard that was 90% asphalt. The school is surrounded by freeways and industrial factories, and students suffer with high asthma rates, said Eleanor Marsh, the school’s former principal.  “In lower income areas the schools have more concrete,” Marsh said. “That is just the reality. And in higher income areas, kids have more natural play structures that have been fundraised for by PTA’s. It becomes an equity issue around mental health and access to core academics.”  The school received a $1.2 million grant from the California Natural Resources Agency’s Urban Greening program and worked with the Trust for Public Land in 2020 to completely renovate the schoolyard, adding more greenery, trees and play structures that would be cooler and more academically enriching.  Students were part of the process, taking the temperature of the asphalt and rubber playground and recommending alternatives.  First: José Luis Rodriguez teaches fifth-grade students about gardening. Groups want more outdoor shade at schools. Last: Students plant succulents at the César E. Chávez Education Center’s living schoolyard in Oakland on April 29, 2024. Photos by Laure Andrillon for CalMatters Now students take outdoor gardening classes and play and run through their new “river” made with bricks, which doubles as a stormwater runoff system on rainy days.  There’s no lack of enthusiasm for greening projects among educators, said Marsh, now principal at San Pedro Elementary School in San Rafael.  “Every public school in California is up against huge budget cuts,” she said. “There is no money at the school site level to improve the physical space for students. So we are really relying on support from the state.”  Where the money could come from  The time to dedicate more funding to green schoolyards is now, said Manny Gonez, director of policy initiatives for the Beverly Hills environmental group TreePeople. The latest proposals for a climate bond, which would be paid off over many years, includes an ask for $150 million for an urban greening grant, which doesn’t exclusively fund school greening programs but has in the past. TreePeople also supports the request for $1 billion in the proposed school infrastructure bond.  “Ultimately the priorities for school facilities funding should be driven by educators and not by the environmental lobby.” Assemblymember Al Muratsuchi, Democrat from Torrance Traditionally school bonds are for new school construction or renovation. School districts can apply for the state bond funds for projects and must provide local matching funds. There is money set aside for financially strapped districts that can’t provide as much of a local match.  “This is a small down payment to really scale up the work that the state has been doing with these 164 schools,” Gonez said, referring to schools that already have green schoolyard grants. The Trust for Public Land wants money set aside for green schoolyard projects and for the most needy schools to get priority, said Juan Altamirano, the group’s director of government affairs. Earmarking the funds in the proposed school bond would boost support for the measure overall, Altamirano said. California voters — even those without children — support more green schoolyards, an April survey of 800 voters by the Trust for Public Land showed.   Some legislators were noncommittal when discussing the request.  Muratsuchi said he has been an environmental champion in the Legislature and understands the need for more green school funding. But in this case, it’s not up to him to define that as a priority in the school infrastructure bond.  “Ultimately the priorities for school facilities funding should be driven by educators and not by the environmental lobby,” he said. Students in International Community Elementary and Think College Now Elementary play soccer during recess on an unpaved surface at the César E. Chávez Education Center’s living schoolyard in Oakland, California, on April 29th, 2024. Unpaved surfaces let water filter into the ground and reduce air temperature. Groups also want more outdoor shade at schools. Photo by Laure Andrillon for CalMatters Glazer denied Calmatters’ request for an interview, saying he is not directly involved in the decision making of this issue.  California already has committed to increasing the tree canopy on schoolyards on paper, but how that will happen is unclear. In the state’s Nature-Based Solutions Climate Targets published in April, officials said the state would prioritize greening schoolyards through its School Facility Program, “ensuring greening schoolyards is not just a consideration but an integral expectation when local educational agencies undertake new school construction projects and modernization projects.”  Gov. Gavin Newsom’s office did not answer questions about plans to fund greening school projects. Alex Stack, a Newsom spokesperson, said “No other governor has done as much as Gov. Newsom to protect people from extreme heat.”  Stacks said the green schoolyard grants already allocated are part of Newsom’s 2022 Extreme Heat Action Plan, funded by $52.3 billion in the California Climate Commitment budget.  Newsom cut the climate budget, and other parts of the budget, by more than 7% in his May revised proposal. 

Too few trees at California’s schools mean there’s little protecting students from a warming planet. Here’s how advocates say the state can pay for more shade.

Students in International Community Elementary and Think College Now Elementary volunteer at the César E. Chávez Education Center living schoolyard in Oakland, California, on April 29th, 2024.

In summary

Too few trees at California’s schools mean there’s little protecting students from a warming planet. Here’s how advocates say the state can pay for more shade.

Schoolyards are hot and getting hotter, but only a tiny fraction of California’s grade school students can play in the shade.

Researchers and advocates are pushing the state to allocate money for green schoolyards, which can include trees, grass or gardens in place of the flat asphalt or rubber play surfaces at most schools. 

With the help of more than $121 million in state grants, 164 schools already are on their way to either designing or building green schoolyards. Many more applied for the school greening grants, with requests totaling more than $350 million for projects they hoped to build.

The high applicant numbers highlight growing demand for greenery at schools as the climate gets hotter. But with California’s Green Schoolyards program depleted and a state general budget deficit of $56 billion over the next two fiscal years, where will the money for green school projects come from? 

Some environmental groups are pushing for a proposed climate bond that would include $350 million for the green schoolyards program. They also are pushing for a $1 billion carve-out in a proposed $14-$15 billion school infrastructure bond that could go before voters this November.

 Students from International Community Elementary School and Think College Now Elementary School play near the Cesar Chavez Living Schoolyard during recess in Oakland on April 29, 2024. Photo by Laure Andrillon for CalMatters
Students from International Community Elementary and Think College Now Elementary play during recess in Oakland on April 29, 2024. Advocates say millions of children lack outdoor shade at California’s public schools. Photo by Laure Andrillon for CalMatters

“It is well known that our K-12 schoolyards, play structures and campuses are among the most dangerous climate liabilities currently facing the state — principally due to the deadly heat and flood potential our kids are being exposed to now,” environment groups wrote in a letter to authors of two school infrastructure bond proposals, Assemblymember Al Muratsuchi, a Democrat from Torrance, and state Sen. Steve Glazer, a Democrat from Orinda.

Muratsuchi told CalMatters he is reluctant to dictate how schools should use bond money. 

“I’m aware of their request, but we have many other requests to consider,” he said, such as funds for heating and air conditioning systems and solar energy on campuses. “But those priorities will be defined by local school districts.”

Learn more about legislators mentioned in this story.

Students need outdoor shade

On a typical 90-degree day under full sun, grass can reach 95 degrees, while asphalt can hit 150  and rubber surfaced play areas can reach 165 degrees, according to research by the UCLA Luskin Center for Innovation. 

Forget 90 degrees; other research predicts much of the country is on track for more than double the usual number of 100-degree days by midcentury. Fresno already averages 33 days of 100+ degrees each year, Sacramento has 19 and Riverside has 14, federal weather data shows

Unrelenting sun and high heat are bad for kids, the Luskin Center says: “Playing outside in the heat can lead to dehydration, headaches, heat stroke and other health impacts.” 

Shade from trees is one of the best ways to cool things down, the researchers said, because it can reduce heat exposure to children by as much as 70 degrees

But most of California’s schools lack tree canopy, and the trees that do exist on campuses are often around the perimeter, where students can’t access their shade during recess. 

Green Schoolyards America, a nonprofit dedicated to building more green space on campuses, recently conducted a study of the tree canopy shading the state’s more than 10,000 public schools. 

It found that an average of 6.4% of the school areas students access are covered by tree shade. More than 2.5 million students attend schools with less than 5% tree canopy in student areas.

That’s a far cry from what urban forestry and climate experts recommend. They say there needs to be enough trees to cover 30% of every city. Driven by that goal, Green Schoolyards America is pushing for ways to plant trees to cover at least 30% of each school area used by children during the day. 

So far only 29,452 California students have that level of tree canopy, out of nearly 6 million students. 

The schoolyard at the César E. Chávez Education Center in Oakland, prior to the creation of a living schoolyard. Photo by Angela DeCenzo, Trust For Public Land
The schoolyard at the César E. Chávez Education Center in Oakland, prior to the creation of a ‘living schoolyard’. Advocates say most of California’s public schools lack trees or other outdoor shade sources, leaving millions of students vulnerable to heat and sun. Photo by Angela DeCenzo, Trust For Public Land

“This is a long-term infrastructure problem,” said Sharon Gamson Danks, chief executive of Green Schoolyards America. 

 “It’s not building a little garden in the corner. It’s actual infrastructure, on par with highway building. It’s an investment, and we want children to not be overlooked in preparing for climate and protecting their health.”

Most greening projects on school campuses include more trees, but they can also include mulch, grassy fields to replace asphalt, and wooden play and learning structures, said Šárka Volejníková, the Trust for Public Land’s program director for Bay Area parks. 

The difference green space makes

At the César E. Chávez Education Center in Oakland, students — many from low income families — used to play on a yard that was 90% asphalt. The school is surrounded by freeways and industrial factories, and students suffer with high asthma rates, said Eleanor Marsh, the school’s former principal. 

“In lower income areas the schools have more concrete,” Marsh said. “That is just the reality. And in higher income areas, kids have more natural play structures that have been fundraised for by PTA’s. It becomes an equity issue around mental health and access to core academics.” 

The school received a $1.2 million grant from the California Natural Resources Agency’s Urban Greening program and worked with the Trust for Public Land in 2020 to completely renovate the schoolyard, adding more greenery, trees and play structures that would be cooler and more academically enriching. 

Students were part of the process, taking the temperature of the asphalt and rubber playground and recommending alternatives. 

Now students take outdoor gardening classes and play and run through their new “river” made with bricks, which doubles as a stormwater runoff system on rainy days. 

There’s no lack of enthusiasm for greening projects among educators, said Marsh, now principal at San Pedro Elementary School in San Rafael. 

“Every public school in California is up against huge budget cuts,” she said. “There is no money at the school site level to improve the physical space for students. So we are really relying on support from the state.” 

Where the money could come from 

The time to dedicate more funding to green schoolyards is now, said Manny Gonez, director of policy initiatives for the Beverly Hills environmental group TreePeople.

The latest proposals for a climate bond, which would be paid off over many years, includes an ask for $150 million for an urban greening grant, which doesn’t exclusively fund school greening programs but has in the past. TreePeople also supports the request for $1 billion in the proposed school infrastructure bond. 

“Ultimately the priorities for school facilities funding should be driven by educators and not by the environmental lobby.”

Assemblymember Al Muratsuchi, Democrat from Torrance

Traditionally school bonds are for new school construction or renovation. School districts can apply for the state bond funds for projects and must provide local matching funds. There is money set aside for financially strapped districts that can’t provide as much of a local match. 

“This is a small down payment to really scale up the work that the state has been doing with these 164 schools,” Gonez said, referring to schools that already have green schoolyard grants.

The Trust for Public Land wants money set aside for green schoolyard projects and for the most needy schools to get priority, said Juan Altamirano, the group’s director of government affairs.

Earmarking the funds in the proposed school bond would boost support for the measure overall, Altamirano said. California voters — even those without children — support more green schoolyards, an April survey of 800 voters by the Trust for Public Land showed.  

Some legislators were noncommittal when discussing the request. 

Muratsuchi said he has been an environmental champion in the Legislature and understands the need for more green school funding. But in this case, it’s not up to him to define that as a priority in the school infrastructure bond. 

“Ultimately the priorities for school facilities funding should be driven by educators and not by the environmental lobby,” he said.

Students in International Community Elementary and Think College Now Elementary play soccer on an unpaved surface in the Cesar Chavez Living Schoolyard during recess, in  Oakland, California,  on April 29th, 2024. Unpaved surfaces are used to allow water to filter into the ground and reduce air temperature.
Students in International Community Elementary and Think College Now Elementary play soccer during recess on an unpaved surface at the César E. Chávez Education Center’s living schoolyard in Oakland, California, on April 29th, 2024. Unpaved surfaces let water filter into the ground and reduce air temperature. Groups also want more outdoor shade at schools. Photo by Laure Andrillon for CalMatters

Glazer denied Calmatters’ request for an interview, saying he is not directly involved in the decision making of this issue. 

California already has committed to increasing the tree canopy on schoolyards on paper, but how that will happen is unclear.

In the state’s Nature-Based Solutions Climate Targets published in April, officials said the state would prioritize greening schoolyards through its School Facility Program, “ensuring greening schoolyards is not just a consideration but an integral expectation when local educational agencies undertake new school construction projects and modernization projects.” 

Gov. Gavin Newsom’s office did not answer questions about plans to fund greening school projects. Alex Stack, a Newsom spokesperson, said “No other governor has done as much as Gov. Newsom to protect people from extreme heat.” 

Stacks said the green schoolyard grants already allocated are part of Newsom’s 2022 Extreme Heat Action Plan, funded by $52.3 billion in the California Climate Commitment budget. 

Newsom cut the climate budget, and other parts of the budget, by more than 7% in his May revised proposal. 

Read the full story here.
Photos courtesy of

The Climate Impact of Owning a Dog

My dog contributes to climate change. I love him anyway.

This story originally appeared on Grist and is part of the Climate Desk collaboration.I’ve been a vegetarian for over a decade. It’s not because of my health, or because I dislike the taste of chicken or beef: It’s a lifestyle choice I made because I wanted to reduce my impact on the planet. And yet, twice a day, every day, I lovingly scoop a cup of meat-based kibble into a bowl and set it down for my 50-pound rescue dog, a husky mix named Loki.WIRED's Guide to How the Universe WorksYour weekly roundup of the best stories on health care, the climate crisis, new scientific discoveries, and more. Until recently, I hadn’t devoted a huge amount of thought to that paradox. Then I read an article in the Associated Press headlined “People often miscalculate climate choices, a study says. One surprise is owning a dog.”The study, led by environmental psychology researcher Danielle Goldwert and published in the journal PNAS Nexus, examined how people perceive the climate impact of various behaviors—options like “adopt a vegan diet for at least one year,” or “shift from fossil fuel car to renewable public transport.” The team found that participants generally overestimated a number of low-impact actions like recycling and using efficient appliances, and they vastly underestimated the impact of other personal decisions, including the decision to “not purchase or adopt a dog.”The real objective of the study was to see whether certain types of climate information could help people commit to more effective actions. But mere hours after the AP published its article, its aim had been recast as something else entirely: an attack on people’s furry family members. “Climate change is actually your fault because you have a dog,” one Reddit user wrote. Others in the community chimed in with ire, ridiculing the idea that a pet Chihuahua could be driving the climate crisis and calling on researchers and the media to stop pointing fingers at everyday individuals.Goldwert and her fellow researchers watched the reactions unfold with dismay. “If I saw a headline that said, ‘Climate scientists want to take your dogs away,’ I would also feel upset,” she said. “They definitely don’t,” she added. “You can quote me on that.”Loki grinning on a hike in the Pacific Northwest. Photograph: Claire Elise Thompson/Grist

COP30’s biofuel gamble could cost the global food supply — and the planet

What was once considered a climate holy grail comes with serious tradeoffs. The world wants more of it anyway.

First the plant stalk is harvested, shredded, and crushed. The extracted juice is then combined with bacteria and yeast in large bioreactors, where the sugars are metabolized and converted into ethanol and carbon dioxide. From there, the liquid is typically distilled to maximize ethanol concentration, before it is blended with gasoline.  You know the final products as biofuels — mostly made from food crops like sugarcane and corn, and endorsed by everyone from agricultural lobbyists to activists and billionaires. Biofuels were developed decades ago to be cheaper, greener alternatives to planet-polluting petrol. As adoption has expanded — now to the point of a pro-biofuel agenda being pushed this week at COP30 in Belém, Brazil — their environmental and food accessibility footprint has remained a source of fierce debate.  The governments of Brazil, Italy, Japan, and India are spearheading a new pledge calling for the rapid global expansion of biofuels as a commitment to decarbonizing transportation energy.  Though the text of the pledge itself is vague, as most COP pledges tend to be, the target embedded in an accompanying International Energy Agency report is clear: expand the global use of so-called sustainable fuels from 2024 levels by at least four times, so that by 2035, sustainable fuels cover 10 percent of all global road transport demand, 15 percent of aviation demand, and 35 percent of shipping fuel demand. By Friday, the last official day of COP30, at least 23 countries have joined the pledge — while Brazilian delegates have been working “hand in hand with industry groups” to get language backing biofuels into the final summit deal.  “Latin America, South East Asia, Africa — they need to improve their efficiency, their energy, and Brazil has a model for this [in its rollout of biofuels],” Roberto Rodrigues, Brazil’s special envoy for agriculture at the summit, said on a COP panel last weekend. As of the time of this story’s publication, the pro-biofuel language hadn’t made it into the latest draft text that outlines the main outcome of the summit released Friday — although it appears the summit could end without a deal.  Read Next At COP30 in Brazil, countries plan to armor themselves against a warming world Zoya Teirstein Though scientists continue to experiment with utilizing other raw materials for biofuels — a list which includes agricultural and forestry waste, cooking oils, and algae — the bulk of feedstocks almost exclusively come from the fields. Different types of food crops are used for different types of biofuels; sugary and starchy crops, such as sugar cane, wheat, and corn, are often made into ethanol; while oily crops, like soybeans, rapeseed, and palm oil, are largely used for biodiesel.  The cycle goes a little like this: Farmers, desperate to replace cropland lost to biofuel production, raze more forests and plow up more grasslands, resulting in deforestation that tends to release far more carbon than burning biofuels saves. But as large-scale production continues to expand, there may be insufficient land, water, and energy available for another big biofuel boom — prompting many researchers and climate activists to question whether countries should be aiming to scale these markets at all. (Thomson Reuters reported that global biofuel production has increased ninefold since 2000.) Biofuels account for the vast majority of “sustainable fuels” currently used worldwide. An analysis by a clean transport advocacy organization published last month found that, because of the indirect impacts to farming and land use, biofuels are responsible globally for 16 percent more CO2 emissions than the planet-polluting fossil fuels they replace. In fact, the report surmises that by 2030, biofuel crops could require land equivalent to the size of France. More than 40 million hectares of Earth’s cropland is already devoted to biofuel feedstocks, an area roughly the size of Paraguay. The EU Deforestation-Free Regulation, or EUDR, cites soybeans among the commodities driving deforestation worldwide. “While countries are right to transition away from fossil fuels, they also need to ensure their plans don’t trigger unintended consequences, such as more deforestation either at home or abroad,” said Janet Ranganathan, managing director of strategy, learning, and results at the World Resources Institute in a statement responding to the Belém pledge. She added that rapidly expanding global biofuel production would have “significant implications for the world’s land, especially without guardrails to prevent large-scale expansion of land dedicated to biofuels, which drives ecosystem loss.” Other environmental issues found to be associated with converting food crops into biofuels include water pollution from fertilizers and pesticides, air pollution, and soil erosion. One study, conducted a decade ago, showed that, when accounting for all the inputs needed to produce different varieties of ethanol or biodiesel — machinery, seeds, water, electricity, fertilizers, transportation, and more — producing fuel-grade ethanol or biodiesel requires significantly more energy input than it creates.  Read Next ‘Everyone is exhausted’: First week of COP30 marked by frustration with slow progress Bob Berwyn, Inside Climate News Nonetheless, it’s not a shock to see Brazil betting big on biofuels at COP30. In Brazil, biofuels make up roughly a quarter of transportation fuels — a remarkably high proportion compared to most other countries. And that share, dominated by sugarcane ethanol, is still on an upward climb, with the Belém pledge evidence of the country’s intended trajectory.  A spokesperson from Brazil’s foreign affairs ministry told The Guardian that the “proponents of the pledge (which include Japan, Italy, India, among others) are calling upon countries to support quadrupling production and use of sustainable fuels — a group of gaseous and liquid fuels that include e-fuels, biogases, biofuels, hydrogen and its derivatives.” They added that the goal is based on the new IEA report that underscores the production increase as necessary to aggressively reduce emissions. That report suggests that if current and proposed national and international policies are implemented and fully legislated, global biofuel use and production would double by 2035. “The word ‘sustainable’ is not used lightly, neither in the report nor in the pledge,” the spokesperson said.  The issue, of course, is in how emissions footprints of something like ethanol fuel production are even measured. Much like many other climate sources, scientists argue that tracking greenhouse gas emissions linked to ethanol fuel should account for emissions at every stage — production, processing, distribution, and vehicle use. Yet that isn’t often the case: in fact, a 2024 paper found that Brazil’s national biofuel policy does not account for all direct and indirect emissions in its calculation.  The exclusions are evident of a larger trend, according to University of Minnesota environmental scientist Jason Hill. “Overall, either those studies have not included [direct and indirect emissions], or they found ways to spread those impacts over anticipated production, decades, centuries, or so forth, that tend to dilute those effects. So the accounting methods aren’t really consistent with what the best science shows,” said Hill, who studies the environmental and economic consequences of food, energy, and biofuel production.  In short: More biofuels means either more intensive agriculture on a smaller share of available cropland, which has its own detrimental environmental effects, or expansion of cropland, and the land-use emissions and environmental impacts that can carry. “Biofuel production today is already a bad idea. And doubling [that] is doubling down on an existing problem,” said Hill.  Read Next COP30 has big plans to save the rainforest. Indigenous activists say it’s not enough. Frida Garza & Miacel Spotted Elk Moreover, diverting crops like corn and soybeans from dinner plates to fuel tanks doesn’t just spark brutal competition for land and resources, it can also spike food prices and leave the world’s most vulnerable populations with less to eat.  A 2022 analysis of the U.S. Renewable Fuel Standard, the world’s largest biofuel program, found that it has led to increased food prices for Americans, with corn prices rising by 30 percent and other crops such as soybean and wheat spiking by around 20 percent. This then set off a domino effect: Increasing annual nationwide fertilizer use by up to 8 percent and water quality degradants by up to 5 percent. The carbon intensity of corn ethanol produced under the mandate has ended up at least equaling the planet-polluting effects of gasoline.  “Biofuel mandates essentially create a baseline demand that can leave food crops by the wayside,” says Ginni Braich, a data scientist at the University of Colorado Boulder who has worked as a senior advisor to government clean technology and emission reduction programs. That’s because of the issue with supply and demand of food crops — higher competition for feedstocks hikes up the prices of food, feed, and farming inputs.  When there are biofuel mandates, which the IEA report underlying the Belém pledge recommends, demand remains inelastic — no matter the changes in yields, growing and weather conditions, prices, or markets. Say there is a huge drought that decimates crop yields, as one example, the baseline demand of biofuels still needs to be met despite depleted food stocks. In terms of supply, increasing growing area for biofuels typically means less area available to grow food crops — which can cause prices to surge alongside supply shortages, and spike costs of seed, inputs, and land. Nutritional implications should also be taken into account, according to Braich. Not only do people’s diets tend to shift when food gets more costly, but cropping patterns are already revealing adverse shifts in dietary diversity, which could be exacerbated by a further concentration on fewer crops. The Belém pledge, and Brazil’s intention to lead a global expansion of the biofuels market, does not bode well for people’s food accessibility nor for the future of the planet, warns Braich.  “It seems quite paradoxical for Brazil to promote the large-scale expansion of biofuels and also be seen as a protector of forests,” she said. “Is it better than decarbonization and fossil fuel divestment rhetoric without actual transition pathways? Yes, but in a lot of ways it is also greenwashing.” This story was originally published by Grist with the headline COP30’s biofuel gamble could cost the global food supply — and the planet on Nov 21, 2025.

Iran's Capital Has Run Out of Water, Forcing It to Move

The decision to move Iran’s capital is partly driven by climate change, but experts say decades of human error and action are also to blame

November 21, 20252 min readIran's Capital Is Moving. The Reason Is an Ecological CatastropheThe move is partly driven by climate change, but experts say decades of human error and action are also to blameBy Humberto Basilio edited by Claire CameronA dry water feature in Tehran on November 9, 2025 TTA KENARE/AFP/Getty ImagesTehran can no longer remain the capital of Iran amid a deepening ecological crisis and acute water shortage.The situation in Tehran is the result of “a perfect storm of climate change and corruption,” says Michael Rubin, a political analyst at the American Enterprise Institute.“We no longer have a choice,” Iranian President Masoud Pezeshkian reportedly told officials on Friday.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.Instead, Iranian officials are considering moving the capital to the country’s southern coast. But experts say the proposal does not change the reality for the nearly ten million people who live in Tehran, who are now suffering the consequences of a decades-long decline in water supply.Since at least 2008, scientists have warned that unchecked groundwater pumping for the city and for agriculture was rapidly draining its aquifers. The overuse did not just deplete underground reserves—it destroyed them, as the land compressed and sank irreversibly. One recent study found that Iran’s central plateau, where most of the country’s aquifers are located, is sinking by more than 35 centimeters each year. As a result, the aquifers lose about 1.7 billion cubic meters of water annually as the ground is permanently crushed, leaving no space for underground water storage to recover, says Darío Solano, a geoscientist at the National Autonomous University of Mexico.“We saw this coming,” says Solano.Other major cities like Cape Town, Mexico City, Jakarta and parts of California are also facing day zero scenarios as they sink and run out of water.This is not the first time Iran’s capital has moved. Over the centuries, it has shifted many times, from Isfahan to Tabriz to Shiraz. Some of these former capitals still thrive while others exist only as ruins, says Rubin. But this marks the first time the Iranian government has moved the capital because of an ecological catastrophe.Yet, Rubin says, “it would be a mistake to look at this only through the lens of climate change.” Water, land and wastewater mismanagement and corruption have made the crisis worse, he says. If the capital moves to the remote Makran coast in the south, it could cost more than $100 billion dollars. The region is known for its harsh climate and difficult terrain, and some experts have doubts about its viability as a national center. Relocating a capital is often driven more by politics than by environmental concerns, says Linda Shi, a social scientist and urban planner at Cornell University. “Climate change is not the thing that is causing it, but it is a convenient factor to blame in order to avoid taking responsibility” for poor political decisions, she says.It’s Time to Stand Up for ScienceIf you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in that two-century history.I’ve been a Scientific American subscriber since I was 12 years old, and it helped shape the way I look at the world. SciAm always educates and delights me, and inspires a sense of awe for our vast, beautiful universe. I hope it does that for you, too.If you subscribe to Scientific American, you help ensure that our coverage is centered on meaningful research and discovery; that we have the resources to report on the decisions that threaten labs across the U.S.; and that we support both budding and working scientists at a time when the value of science itself too often goes unrecognized.In return, you get essential news, captivating podcasts, brilliant infographics, can't-miss newsletters, must-watch videos, challenging games, and the science world's best writing and reporting. You can even gift someone a subscription.There has never been a more important time for us to stand up and show why science matters. I hope you’ll support us in that mission.

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