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Gulf Coast petrochemical growth draws billions in tax breaks despite pollution violations

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Friday, March 15, 2024

Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news. A booming petrochemical buildout on the Gulf Coast has drawn billions of dollars in public subsidies from state tax abatement programs despite regular violations of pollution permits, according to a new report released Thursday. The Environmental Integrity Project, an environmental nonprofit based in Texas and Washington, D.C., compiled data on all U.S. plastics projects built, expanded or proposed since 2012, almost all of them along the Gulf Coast. The report identified 50 plastics complexes built or expanded in the last 12 years, 33 of them in Texas, where they have drawn a total of $1.65 billion in property tax breaks through the state’s Chapter 313 program for energy and manufacturing companies, which the state legislature replaced last year with a new but similar program. That’s a tiny dent in Texas’ $250 billion annual tax revenue, but it’s just one visible slice of the total concessions corporations receive to do business in Texas, and it represents lost income that would have gone primarily to the state’s public schools, which are struggling with shortfalls in teachers and funding. Now, companies are proposing to build an additional 42 plastics plants, 24 of them in Texas, according to the 73-page EIP report, “Feeding the Plastics Industrial Complex.” “The industry is expanding rapidly, and more communities are being asked to consider public subsidies,” it said. “None of the state programs we examined require industries to follow the terms of their state pollution control permits.” While Texas hosts the most new plastics production, the most generous tax breaks come from neighboring Louisiana, among the nation’s poorest states, where three projects alone drew $6.5 billion in local discounts since 2013. All operating projects considered in the EIP report claimed a total of $9 billion in exchange for commitments to economic development and job growth. That money would have otherwise funded local schools and public services, said Alexandra Shaykevich, research manager at the Environmental Integrity Project. Instead, it’s given to highly profitable corporations that are often foreign-owned and likely would have located near the nation’s major oil and gas resources with-or-without local tax incentives, according to her group’s report. Most facilities reviewed by the EIP reported repeated violations of their pollution permits, Shaykevich said, but those violations never jeopardized their tax subsidies. “I think if companies can’t obey the law they shouldn't be rewarded with taxpayer money,” she said. “We would certainly advocate for making subsidies conditional on compliance.” The American Chemistry Council and the Texas Chemistry Council, which represent the plastics business, did not immediately respond to requests for comment. Texas Sen. Charles Schwertner, chair of the Senate Committee on Business and Commerce, said the state’s tax incentive program “bolsters economically distressed communities and enhances its competitive advantage in attracting vital industries.” “The program ensures that the Texas economic miracle continues to thrive by offering quality employment opportunities for Texans and investments in our communities,” Schwertner said. Gulf Coast Expansion  The recent growth in Gulf Coast petrochemicals, which include plastics, are a result of the ongoing boom in hydraulic fracturing upstream in the Eagle Ford Shale and Permian Basin of Texas. Pipelines carry oil and gas hundreds of miles to the coast, where refineries and chemical plants produce commercial products and load them onto ships for sale overseas. The United States . remains a world leader in petrochemical production and export thanks primarily to these industries, said Joe Powell, executive director of the Energy Transition Institute at the University of Houston. “We’ve got really good energy prices here on the Gulf Coast because of fracking,” he said. “That makes the U.S. Gulf Coast a really good investment opportunity, especially in petrochemicals.” Within plastics, he said, most recent growth has come from ethane crackers, facilities that turn natural gas into ethylene, which, according to the American Chemistry Council, can be made into polymers that are “used to manufacture fibers, bins, pails, crates, bottles, piping, food packaging films, trash liners, bags, wire and cable sheathing, insulation, surface coatings for paper and cardboard, and a wide variety of other products.” The U.S. is the top exporter of ethylene polymers, much of which go to China, the world’s top importer. Powell, a former chief scientist for Shell, the global energy company, said years of rapid expansions have brought a glut of ethylene to market and left the Gulf Coast overbuilt in the short term, which he called “typical of the chemical business.” But in the long term, robust demand for plastics is expected to rapidly grow. The Paris-based Organisation for Economic Co-operation and Development predicts global plastics demand will triple between 2019 and 2060. Much of that supply will come from Texas. High demand for plastics and other petrochemicals will support a growing share of fossil fuel production, said Tom Sanzillo, a director of financial analysis at the Institute for Energy Economics and Financial Analysis, as major sectors like transportation fuels and power generation shift to more sustainable forms of energy. Proposed Projects in Texas For its report, the EIP drew on public records, including permit applications and company announcements, to compile a list of plastics projects currently proposed. Their data shows a wave of new development still planned for the Texas coast, including seven new complexes and 20 expansions at existing complexes. For example, it said Formosa Plastics, a $460 billion Taiwanese company, has proposed to build a new vinyl chloride reactor, which produces material for PVC plastic, at its 2,500-acre Point Comfort complex on Lavaca Bay. (The company has quietly advanced other expansion plans lately, as well.) At neighboring Matagorda Bay, German petrochemical manufacturer Roehm plans to turn greenfields into a new plant to produce methyl methacrylate, a component of common construction plastics. In Corpus Christi, a joint Singaporean-Taiwanese-Mexican venture plans to build a new manufacturing complex for polyethylene terephthalate, a common plastic in disposable packaging, named “Project Jumbo.” The complex, proposed by the companies Indorama, Far Eastern New Century and Alpek, will also include a desalination plant to pull seawater from Nueces Bay. Near Houston, ExxonMobil plans three major expansions at its massive Baytown complex: a new cracking furnace, expansion of its polypropylene plant and a new hydrogen plant to power those and other units. The highest concentration of proposed new plastics complexes surrounds Port Arthur, a small city ringed in heavy industry that boasts some of the last available ship channel waterfront on the Gulf. There, Motiva Enterprises, which is owned by the government of Saudi Arabia, has proposed a new ethylene unit consisting of eight furnaces next to its existing Port Arthur refinery. Ethylene is produced by heating natural gas or petroleum to above 800 degrees Celsius, which produces a mixture of gases from which ethylene is separated. Texas-based companies Energy Transfer, Enterprise Products Partners and Chevron Philipps Chemical have also proposed new complexes of ethylene and polyethylene units in the area. “Our local government and our state government welcomes this activity, but the people who live in the shadows of the industry are the ones who continue to suffer,” said Hilton Kelley, 63, a community organizer from Port Arthur. “In most of these situations around the nation, you will find that it’s people of color.” Forty-three percent of Port Arthur residents are Black, more than three times the statewide average. Much of the city is in the 95th percentile nationally for both the volume of toxic air pollution released and resulting cancer risk, according to the U.S. Environmental Protection Agency. Credit: James Bruggers/Inside Climate News “We’re just like a dumping ground,” said Kelley. “A large number of my friends and relatives have died from cancer.” But despite the abundance of multibillion-dollar industries in Port Arthur, median household income is 37 percent less than Texas as a whole while its poverty rate is nearly double. State Tax Abatement Programs In its report, the EIP found at least two-thirds of the 50 recently completed plastics projects it reviewed nationally received tax abatements through state or local governments. Of the top four recipients, three were in Louisiana, drawing a combined $4.6 billion from the state’s Industrial Tax Exemption Program since 2013, and one was in Pennsylvania, a massive Shell ethylene plant in Beaver County outside Pittsburgh, which drew $1.65 billion from Pennsylvania’s Resource Manufacturing Tax Credit. All were owned, in part or in full, by corporations from Asia, Africa or Europe. The fifth top recipient was Dow Chemical’s Freeport chemical complex in Brazoria County, which received $393 million in operating discounts since 2013 through Texas’ Chapter 313 tax abatement program. Dow did not immediately respond to a request for comment. “It sounds like a lot of money. But in this game that some people would call interstate competition for growth and others would call corporate welfare, it’s not an overwhelming amount,” said Mike Kraten, director of accounting program initiatives at the University of Houston’s Bauer College of Business. “I think anyone would agree that this has become par for the course.” Chapter 313, one of many tax abatement programs in Texas, represents a small slice of the total incentives that companies may receive to invest here. The biggest concessions are typically custom-negotiated in private between company lobbyists and state or local governmental development offices, Kraten said. Chapter 313 drew criticism from both Republicans and Democrats in Texas. The conservative think tank Texas Public Policy Foundation called it“unnecessary and wasteful.”Texas doesn’t need to offer tax incentives, critics argued, because its oil and gas fields mean companies will locate here anyway. Last year, the Texas Legislature replaced the Chapter 313 program with a similar program called Chapter 403, which the think tank Every Texan called “better in some ways, worse in others.” According to Dick Lavine, a senior analyst at Every Texan, two 403 agreements have been signed to date. Meanwhile, the Texas comptroller’s office shows 872 tax abatement agreements still active under Chapter 313. Last year, an analysis by the Houston Chronicle showed those outstanding agreements will cost Texas taxpayers $31 billion in lost revenue over the next 30 years. Regular Violations of Pollution Permits  These subsidies are awarded irrespective of companies’ history of compliance with environmental law, the EIP report found.. Of the plastics plants it considered, 84 percent had self-reported violations of their pollution permits to state environmental regulators. “They seldom face penalties and never have their public subsidies revoked, no matter how frequent their environmental permit violation,” the report said. For example, it cited Gulf Coast Growth Ventures, a huge, new plastics plant outside Corpus Christi, jointly owned by the Saudi Basic Industries Corp. and ExxonMobil, the world’s largest private oil company, which posted a record $56 billion profit in 2022. Located in the town of Gregory, which is 90 percent Hispanic, the project secured in 2017 a $249 million tax break from the Gregory-Portland Independent School District for the period between 2022 and 2032. Then, between 2021 and 2022, the facility reported 10 unpermitted pollution releases totalling 560,802 pounds due to equipment failure, emergency flaring or unplanned shutdowns. During one incident in 2022, the glow of burning ground flares was visible from 20 miles away for days, according to the Corpus Christi Caller Times. The plant also incurred 63 violations from Texas’ environmental regulator in less than two years, according to the EIP report. “These include failure to comply with limits for pollutants such as nitrogen oxide and carbon monoxide, failure to properly sample and analyze discharges of stormwater from the site, and failing to properly operate and monitor its flares,” the report said. An ExxonMobil spokesperson, Lauren Knight, said Gulf Coast Growth Ventures has donated $20 million to the local community “including local enrichment projects, environmental preservation, STEM programs, city infrastructure and air monitoring.” Knight said air monitors installed in 2019 have shown no change in air quality since. “At all of our sites, our focus is on reducing emissions, improving air quality and protecting the environment. We maintain the highest standards for safety, health and environmental care and comply with all applicable laws and regulations,” Knight said. All of the top seven U.S. plastics plants that incurred legal penalties for Clean Air Act violations between 2020 and 2023 were in Texas, the report found. Brandy Deason, climate justice coordinator for the nonprofit Air Alliance Houston, which collaborated on the report, said public subsidies shouldn’t go to companies that harm public health beyond what their pollution permits allow. Before Air Alliance Houston, she worked at commercial laboratories in Louisiana and Texas that analyzed air samples from industrial operators for their reports to regulators. That’s where she realized what sorts of vapors wafted from refineries and chemical plants—things like benzene, butadiene and all manner of volatile organic compounds. “I saw the air pollution first hand. I ran it through the instruments. I did the reports,” she said. “I saw a lot of pollution.” What frustrates her most, she said, was the pointlessness of much of it. While many plastics are now used in construction and high-grade medical gear, much more goes to single-use packaging that wasn’t present in the world just a few decades ago. And, she said, campaigns by Air Alliance Houston and its allies to slow the pace of plastics expansions authorized by Texas regulators have been largely ineffective. “Even if the community speaks out, permits are almost never denied,” she said. “We’re constantly showing them the problems, we just get ignored and they get the permits.” Disclosure: Air Alliance Houston, Dow Chemical, Energy Transfer, Every Texan, Exxon Mobil Corporation, Texas Public Policy Foundation and University of Houston have been financial supporters of The Texas Tribune, a nonprofit, nonpartisan news organization that is funded in part by donations from members, foundations and corporate sponsors. Financial supporters play no role in the Tribune's journalism. Find a complete list of them here. We can’t wait to welcome you to downtown Austin Sept. 5-7 for the 2024 Texas Tribune Festival! Join us at Texas’ breakout politics and policy event as we dig into the 2024 elections, state and national politics, the state of democracy, and so much more. When tickets go on sale this spring, Tribune members will save big. Donate to join or renew today.

A new report by the Environmental Integrity Project compiled data on every U.S. plastics plant built, expanded or proposed since 2012, revealing massive growth in Texas.

Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news.


A booming petrochemical buildout on the Gulf Coast has drawn billions of dollars in public subsidies from state tax abatement programs despite regular violations of pollution permits, according to a new report released Thursday.

The Environmental Integrity Project, an environmental nonprofit based in Texas and Washington, D.C., compiled data on all U.S. plastics projects built, expanded or proposed since 2012, almost all of them along the Gulf Coast.

The report identified 50 plastics complexes built or expanded in the last 12 years, 33 of them in Texas, where they have drawn a total of $1.65 billion in property tax breaks through the state’s Chapter 313 program for energy and manufacturing companies, which the state legislature replaced last year with a new but similar program.

That’s a tiny dent in Texas’ $250 billion annual tax revenue, but it’s just one visible slice of the total concessions corporations receive to do business in Texas, and it represents lost income that would have gone primarily to the state’s public schools, which are struggling with shortfalls in teachers and funding.

Now, companies are proposing to build an additional 42 plastics plants, 24 of them in Texas, according to the 73-page EIP report, “Feeding the Plastics Industrial Complex.”

“The industry is expanding rapidly, and more communities are being asked to consider public subsidies,” it said. “None of the state programs we examined require industries to follow the terms of their state pollution control permits.”

While Texas hosts the most new plastics production, the most generous tax breaks come from neighboring Louisiana, among the nation’s poorest states, where three projects alone drew $6.5 billion in local discounts since 2013. All operating projects considered in the EIP report claimed a total of $9 billion in exchange for commitments to economic development and job growth.

That money would have otherwise funded local schools and public services, said Alexandra Shaykevich, research manager at the Environmental Integrity Project. Instead, it’s given to highly profitable corporations that are often foreign-owned and likely would have located near the nation’s major oil and gas resources with-or-without local tax incentives, according to her group’s report.

Most facilities reviewed by the EIP reported repeated violations of their pollution permits, Shaykevich said, but those violations never jeopardized their tax subsidies.

“I think if companies can’t obey the law they shouldn't be rewarded with taxpayer money,” she said. “We would certainly advocate for making subsidies conditional on compliance.”

The American Chemistry Council and the Texas Chemistry Council, which represent the plastics business, did not immediately respond to requests for comment.

Texas Sen. Charles Schwertner, chair of the Senate Committee on Business and Commerce, said the state’s tax incentive program “bolsters economically distressed communities and enhances its competitive advantage in attracting vital industries.”

“The program ensures that the Texas economic miracle continues to thrive by offering quality employment opportunities for Texans and investments in our communities,” Schwertner said.

Gulf Coast Expansion 

The recent growth in Gulf Coast petrochemicals, which include plastics, are a result of the ongoing boom in hydraulic fracturing upstream in the Eagle Ford Shale and Permian Basin of Texas. Pipelines carry oil and gas hundreds of miles to the coast, where refineries and chemical plants produce commercial products and load them onto ships for sale overseas.

The United States . remains a world leader in petrochemical production and export thanks primarily to these industries, said Joe Powell, executive director of the Energy Transition Institute at the University of Houston.

“We’ve got really good energy prices here on the Gulf Coast because of fracking,” he said. “That makes the U.S. Gulf Coast a really good investment opportunity, especially in petrochemicals.”

Within plastics, he said, most recent growth has come from ethane crackers, facilities that turn natural gas into ethylene, which, according to the American Chemistry Council, can be made into polymers that are “used to manufacture fibers, bins, pails, crates, bottles, piping, food packaging films, trash liners, bags, wire and cable sheathing, insulation, surface coatings for paper and cardboard, and a wide variety of other products.”

The U.S. is the top exporter of ethylene polymers, much of which go to China, the world’s top importer.

Powell, a former chief scientist for Shell, the global energy company, said years of rapid expansions have brought a glut of ethylene to market and left the Gulf Coast overbuilt in the short term, which he called “typical of the chemical business.”

But in the long term, robust demand for plastics is expected to rapidly grow. The Paris-based Organisation for Economic Co-operation and Development predicts global plastics demand will triple between 2019 and 2060. Much of that supply will come from Texas.

High demand for plastics and other petrochemicals will support a growing share of fossil fuel production, said Tom Sanzillo, a director of financial analysis at the Institute for Energy Economics and Financial Analysis, as major sectors like transportation fuels and power generation shift to more sustainable forms of energy.

Proposed Projects in Texas

For its report, the EIP drew on public records, including permit applications and company announcements, to compile a list of plastics projects currently proposed. Their data shows a wave of new development still planned for the Texas coast, including seven new complexes and 20 expansions at existing complexes.

For example, it said Formosa Plastics, a $460 billion Taiwanese company, has proposed to build a new vinyl chloride reactor, which produces material for PVC plastic, at its 2,500-acre Point Comfort complex on Lavaca Bay. (The company has quietly advanced other expansion plans lately, as well.)

At neighboring Matagorda Bay, German petrochemical manufacturer Roehm plans to turn greenfields into a new plant to produce methyl methacrylate, a component of common construction plastics.

In Corpus Christi, a joint Singaporean-Taiwanese-Mexican venture plans to build a new manufacturing complex for polyethylene terephthalate, a common plastic in disposable packaging, named “Project Jumbo.” The complex, proposed by the companies Indorama, Far Eastern New Century and Alpek, will also include a desalination plant to pull seawater from Nueces Bay.

Near Houston, ExxonMobil plans three major expansions at its massive Baytown complex: a new cracking furnace, expansion of its polypropylene plant and a new hydrogen plant to power those and other units.

The highest concentration of proposed new plastics complexes surrounds Port Arthur, a small city ringed in heavy industry that boasts some of the last available ship channel waterfront on the Gulf. There, Motiva Enterprises, which is owned by the government of Saudi Arabia, has proposed a new ethylene unit consisting of eight furnaces next to its existing Port Arthur refinery. Ethylene is produced by heating natural gas or petroleum to above 800 degrees Celsius, which produces a mixture of gases from which ethylene is separated.

Texas-based companies Energy Transfer, Enterprise Products Partners and Chevron Philipps Chemical have also proposed new complexes of ethylene and polyethylene units in the area.

“Our local government and our state government welcomes this activity, but the people who live in the shadows of the industry are the ones who continue to suffer,” said Hilton Kelley, 63, a community organizer from Port Arthur. “In most of these situations around the nation, you will find that it’s people of color.”

Forty-three percent of Port Arthur residents are Black, more than three times the statewide average. Much of the city is in the 95th percentile nationally for both the volume of toxic air pollution released and resulting cancer risk, according to the U.S. Environmental Protection Agency.

Credit: James Bruggers/Inside Climate News

“We’re just like a dumping ground,” said Kelley. “A large number of my friends and relatives have died from cancer.”

But despite the abundance of multibillion-dollar industries in Port Arthur, median household income is 37 percent less than Texas as a whole while its poverty rate is nearly double.

State Tax Abatement Programs

In its report, the EIP found at least two-thirds of the 50 recently completed plastics projects it reviewed nationally received tax abatements through state or local governments.

Of the top four recipients, three were in Louisiana, drawing a combined $4.6 billion from the state’s Industrial Tax Exemption Program since 2013, and one was in Pennsylvania, a massive Shell ethylene plant in Beaver County outside Pittsburgh, which drew $1.65 billion from Pennsylvania’s Resource Manufacturing Tax Credit. All were owned, in part or in full, by corporations from Asia, Africa or Europe.

The fifth top recipient was Dow Chemical’s Freeport chemical complex in Brazoria County, which received $393 million in operating discounts since 2013 through Texas’ Chapter 313 tax abatement program. Dow did not immediately respond to a request for comment.

“It sounds like a lot of money. But in this game that some people would call interstate competition for growth and others would call corporate welfare, it’s not an overwhelming amount,” said Mike Kraten, director of accounting program initiatives at the University of Houston’s Bauer College of Business. “I think anyone would agree that this has become par for the course.”

Chapter 313, one of many tax abatement programs in Texas, represents a small slice of the total incentives that companies may receive to invest here. The biggest concessions are typically custom-negotiated in private between company lobbyists and state or local governmental development offices, Kraten said.

Chapter 313 drew criticism from both Republicans and Democrats in Texas. The conservative think tank Texas Public Policy Foundation called it“unnecessary and wasteful.”Texas doesn’t need to offer tax incentives, critics argued, because its oil and gas fields mean companies will locate here anyway.

Last year, the Texas Legislature replaced the Chapter 313 program with a similar program called Chapter 403, which the think tank Every Texan called “better in some ways, worse in others.”

According to Dick Lavine, a senior analyst at Every Texan, two 403 agreements have been signed to date. Meanwhile, the Texas comptroller’s office shows 872 tax abatement agreements still active under Chapter 313.

Last year, an analysis by the Houston Chronicle showed those outstanding agreements will cost Texas taxpayers $31 billion in lost revenue over the next 30 years.

Regular Violations of Pollution Permits 

These subsidies are awarded irrespective of companies’ history of compliance with environmental law, the EIP report found.. Of the plastics plants it considered, 84 percent had self-reported violations of their pollution permits to state environmental regulators.

“They seldom face penalties and never have their public subsidies revoked, no matter how frequent their environmental permit violation,” the report said.

For example, it cited Gulf Coast Growth Ventures, a huge, new plastics plant outside Corpus Christi, jointly owned by the Saudi Basic Industries Corp. and ExxonMobil, the world’s largest private oil company, which posted a record $56 billion profit in 2022.

Located in the town of Gregory, which is 90 percent Hispanic, the project secured in 2017 a $249 million tax break from the Gregory-Portland Independent School District for the period between 2022 and 2032.

Then, between 2021 and 2022, the facility reported 10 unpermitted pollution releases totalling 560,802 pounds due to equipment failure, emergency flaring or unplanned shutdowns. During one incident in 2022, the glow of burning ground flares was visible from 20 miles away for days, according to the Corpus Christi Caller Times.

The plant also incurred 63 violations from Texas’ environmental regulator in less than two years, according to the EIP report.

“These include failure to comply with limits for pollutants such as nitrogen oxide and carbon monoxide, failure to properly sample and analyze discharges of stormwater from the site, and failing to properly operate and monitor its flares,” the report said.

An ExxonMobil spokesperson, Lauren Knight, said Gulf Coast Growth Ventures has donated $20 million to the local community “including local enrichment projects, environmental preservation, STEM programs, city infrastructure and air monitoring.” Knight said air monitors installed in 2019 have shown no change in air quality since.

“At all of our sites, our focus is on reducing emissions, improving air quality and protecting the environment. We maintain the highest standards for safety, health and environmental care and comply with all applicable laws and regulations,” Knight said.

All of the top seven U.S. plastics plants that incurred legal penalties for Clean Air Act violations between 2020 and 2023 were in Texas, the report found.

Brandy Deason, climate justice coordinator for the nonprofit Air Alliance Houston, which collaborated on the report, said public subsidies shouldn’t go to companies that harm public health beyond what their pollution permits allow.

Before Air Alliance Houston, she worked at commercial laboratories in Louisiana and Texas that analyzed air samples from industrial operators for their reports to regulators. That’s where she realized what sorts of vapors wafted from refineries and chemical plants—things like benzene, butadiene and all manner of volatile organic compounds.

“I saw the air pollution first hand. I ran it through the instruments. I did the reports,” she said. “I saw a lot of pollution.”

What frustrates her most, she said, was the pointlessness of much of it. While many plastics are now used in construction and high-grade medical gear, much more goes to single-use packaging that wasn’t present in the world just a few decades ago.

And, she said, campaigns by Air Alliance Houston and its allies to slow the pace of plastics expansions authorized by Texas regulators have been largely ineffective.

“Even if the community speaks out, permits are almost never denied,” she said. “We’re constantly showing them the problems, we just get ignored and they get the permits.”

Disclosure: Air Alliance Houston, Dow Chemical, Energy Transfer, Every Texan, Exxon Mobil Corporation, Texas Public Policy Foundation and University of Houston have been financial supporters of The Texas Tribune, a nonprofit, nonpartisan news organization that is funded in part by donations from members, foundations and corporate sponsors. Financial supporters play no role in the Tribune's journalism. Find a complete list of them here.


We can’t wait to welcome you to downtown Austin Sept. 5-7 for the 2024 Texas Tribune Festival! Join us at Texas’ breakout politics and policy event as we dig into the 2024 elections, state and national politics, the state of democracy, and so much more. When tickets go on sale this spring, Tribune members will save big. Donate to join or renew today.

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Exoplanet atmospheres are a key to habitability

The habitable zone of a planet might be key to whether life can survive there. But so are exoplanet atmospheres, scientists say. The post Exoplanet atmospheres are a key to habitability first appeared on EarthSky.

Artist’s concept of exoplanet GJ 9827 d. It might be a steam world, with lots of water vapor in its atmosphere. Astronomers say exoplanet atmospheres are a key to whether or not life could survive on a planet. Image via NASA/ ESA/ Leah Hustak (STScI)/ Ralf Crawford (STScI)/ University of Montreal. Scientists focus on the habitable zone (where liquid water might exist) when they are gauging whether an exoplanet could be habitable. But exoplanet atmospheres are also key to whether a planet can maintain stable, life-supporting conditions. For life to persist on a planet, the environment must be stable. A planet’s surface, oceans and atmosphere can work together to regulate the system. By Morgan Underwood, Rice University EarthSky isn’t powered by billionaires. We’re powered by you.Support EarthSky’s 2025 Donation Campaign and help keep science accessible. Exoplanet atmospheres are a key to habitability When astronomers search for planets that could host liquid water on their surface, they start by looking at a star’s habitable zone. Water is a key ingredient for life, and on a planet too close to its star, water on its surface may boil. Too far, and it could freeze. This zone marks the region in-between. But being in this sweet spot doesn’t automatically mean a planet is hospitable to life. Other factors, like whether a planet is geologically active or has processes that regulate gases in its atmosphere, play a role. The habitable zone provides a useful guide to search for signs of life on exoplanets, or planets outside our solar system orbiting other stars. But what’s in these planets’ atmospheres holds the next clue about whether liquid water – and possibly life – exists beyond Earth. The greenhouse effect On Earth, the greenhouse effect, caused by gases like carbon dioxide and water vapor, keeps the planet warm enough for liquid water and life as we know it. Without an atmosphere, Earth’s surface temperature would average around 0 degrees Fahrenheit (-18 C), far below the freezing point of water. The boundaries of the habitable zone are defined by how much of a greenhouse effect is necessary to maintain the surface temperatures that allow for liquid water to persist. It’s a balance between sunlight and atmospheric warming. Many planetary scientists, including me, are seeking to understand if the processes responsible for regulating Earth’s climate are operating on other habitable-zone worlds. We use what we know about Earth’s geology and climate to predict how these processes might appear elsewhere. That is where my geoscience expertise comes in. Picturing the habitable zone of a solar system analog, with Venus- and Mars-like planets outside of the “just right” temperature zone. Image via NASA. Why the habitable zone? The habitable zone is a simple and powerful idea, and for good reason. It provides a starting point, directing astronomers to where they might expect to find planets with liquid water. But without needing to know every detail about the planet’s atmosphere or history. Its definition is partially informed by what scientists know about Earth’s rocky neighbors. Mars, which lies just outside the outer edge of the habitable zone, shows clear evidence of ancient rivers and lakes where liquid water once flowed. Similarly, Venus is currently too close to the sun to be within the habitable zone. Yet, some geochemical evidence and modeling studies suggest Venus may have had water in its past. Though how much and for how long remains uncertain. These examples show that while the habitable zone is not a perfect predictor of habitability, it provides a useful starting point. How to have a stable environment What the habitable zone doesn’t do is determine whether a planet can sustain habitable conditions over long periods of time. On Earth, a stable climate allowed life to emerge and persist. Liquid water could remain on the surface, giving slow chemical reactions enough time to build the molecules of life. This let early ecosystems develop resilience to change, which reinforced habitability. Life emerged on Earth, but continued to reshape the environments it evolved in, making them more conducive to life. This stability likely unfolded over hundreds of millions of years, as the planet’s surface, oceans and atmosphere worked together as part of a slow but powerful system to regulate Earth’s temperature. Recycling inorganic carbon A key part of this system is how Earth recycles inorganic carbon between the atmosphere, surface and oceans over the course of millions of years. Inorganic carbon refers to carbon bound in atmospheric gases, dissolved in seawater or locked in minerals, rather than biological material. This part of the carbon cycle acts like a natural thermostat. When volcanoes release carbon dioxide into the atmosphere, the carbon dioxide molecules trap heat and warm the planet. As temperatures rise, rain and weathering draw carbon out of the air and store it in rocks and oceans. If the planet cools, this process slows down. This allows carbon dioxide, a warming greenhouse gas, to build up in the atmosphere again. This part of the carbon cycle has helped Earth recover from past ice ages and avoid runaway warming. Even as the sun has gradually brightened, this cycle has contributed to keeping temperatures on Earth within a range where liquid water and life can persist for long spans of time. Similar cycles in exoplanet atmospheres? Now, scientists are asking whether similar geological processes might operate on other planets. And if so, how they might detect them. For example, if researchers could observe enough rocky planets in their stars’ habitable zones, they could look for a pattern connecting the amount of sunlight a planet receives and how much carbon dioxide is in its atmosphere. Finding such a pattern may hint that the same kind of carbon-cycling process could be operating elsewhere. The mix of gases in a planet’s atmosphere is shaped by what’s happening on or below its surface. One study shows that measuring atmospheric carbon dioxide in a number of rocky planets could reveal whether their surfaces are broken into a number of moving plates, like Earth’s, or if their crusts are more rigid. On Earth, these shifting plates drive volcanism and rock weathering, which are key to carbon cycling. Simulation of what space telescopes, like the Habitable Worlds Observatory, will capture when looking at distant solar systems. Image via STScI/ NASA GSFC. Keeping an eye on distant exoplanet atmospheres The next step will be toward gaining a population-level perspective of planets in their stars’ habitable zones. By analyzing atmospheric data from many rocky planets, researchers can look for trends that reveal the influence of underlying planetary processes, such as the carbon cycle. Scientists could then compare these patterns with a planet’s position in the habitable zone. Doing so would allow them to test whether the zone accurately predicts where habitable conditions are possible, or whether some planets maintain conditions suitable for liquid water beyond the zone’s edges. This kind of approach is especially important given the diversity of exoplanets. Many exoplanets fall into categories that don’t exist in our solar system. These include super Earths and mini Neptunes. Others orbit stars smaller and cooler than the sun. NASA’s Habitable Worlds Observatory The datasets needed to explore and understand this diversity are just on the horizon. NASA’s upcoming Habitable Worlds Observatory will be the first space telescope designed specifically to search for signs of habitability and life on planets orbiting other stars. It will directly image Earth-sized planets around sunlike stars to study their atmospheres in detail. Instruments on the observatory will analyze starlight passing through these atmospheres to detect gases like carbon dioxide, methane, water vapor and oxygen. As starlight filters through a planet’s atmosphere, different molecules absorb specific wavelengths of light, leaving behind a chemical fingerprint that reveals which gases are present. These compounds offer insight into the processes shaping these worlds. The Habitable Worlds Observatory is under active scientific and engineering development, with a potential launch targeted for the 2030s. Combined with today’s telescopes, which are increasingly capable of observing atmospheres of Earth-sized worlds, scientists may soon be able to determine whether the same planetary processes that regulate Earth’s climate are common throughout the galaxy, or uniquely our own. NASA’s planned Habitable Worlds Observatory will look for exoplanets that could potentially host life. Morgan Underwood, Ph.D. Candidate in Earth, Environmental and Planetary Sciences, Rice University This article is republished from The Conversation under a Creative Commons license. Read the original article. Bottom line: The habitable zone of a planet might be key to whether life can survive there. But so are exoplanet atmospheres, scientists say.The post Exoplanet atmospheres are a key to habitability first appeared on EarthSky.

Some California landfills are on fire and leaking methane. Newly proposed rules could make them safer

California is considering adopting new rules to better identify and more quickly to respond to dangerous methane leaks and underground fires at landfills statewide.

A vast canyon of buried garbage has been smoldering inside a landfill in the Santa Clarita Valley, inducing geysers of liquid waste onto the surface and noxious fumes into the air.In the Inland Empire, several fires have broken out on the surface of another landfill. In the San Fernando Valley, an elementary school has occasionally canceled recess due to toxic gases emanating from rain-soaked, rotting garbage from a nearby landfill. And, in the San Francisco Bay Area, burrowing rodents may be digging into entombed trash at a landfill-turned-park, unloosing explosive levels of methane.These are just a few of the treacherous episodes that have recently transpired at landfills in California, subjecting the state’s waste management industry to growing scrutiny by residents and regulators.Landfill emissions — produced by decaying food, paper and other organic waste — are a major source of planet-warming greenhouse gases and harmful air pollution statewide. But mismanagement, aging equipment and inadequate oversight have worsened this pollution in recent years, according to environmental regulators and policy experts.This week, the California Air Resources Board will vote on adopting a new slate of requirements to better identify and more quickly respond to methane leaks and disastrous underground fires at large landfills statewide.The proposal calls for using satellites, drones and other new technologies to more comprehensively investigate methane leaks. It also would require landfill operators to take corrective action within a few days of finding methane leaks or detecting elevated temperatures within their pollution control systems.In recent years, state regulators have pinpointed at least two landfills in Southern California experiencing “rare” underground landfill fires — largely uncontrollable disasters that have burned troves of buried garbage and released toxic fumes into the air. More recently, a new state satellite program has detected 17 methane plumes from nine landfills between July and October, potentially leaking the flammable gas into unwanted areas and contributing to climate change.Proponents of the proposed rule say the added oversight could help reduce California’s second-largest source of methane, a potent greenhouse gas that warms the atmosphere much more than carbon dioxide. It could also bring relief to hundreds of thousands of people who live nearby landfills and may be exposed to toxic pollutants like hydrogen sulfide or benzene.“Curbing methane emissions is a relatively quick and cost-effective way to reduce the greenhouse pollution that’s wreaking havoc with our climate,” said Bill Magavern, policy director at the Coalition for Clean Air. “But [we’ve] also been involved in updating and strengthening the rule because we’re seeing the community impacts of leaking landfills, particularly at places like Chiquita Canyon, where we have a landfill fire that is making people in the community sick.”Nearly 200 landfills statewide would be subject to the proposed requirements — 48 are privately owned and 140 are government-owned.Many landfill operators oppose the rule, saying the new requirements would saddle the industry with an untenable workload and millions of dollars each year in added costs. These costs could be passed on to residents, whose garbage fees have already risen significantly in recent years.Sacramento County officials, who operate the Kiefer Landfill, said the proposed protocols were not feasible. “As a public landfill, Kiefer cannot quickly adapt to regulatory shifts of this magnitude, and these increased costs would ultimately burden the community it serves,” Sacramento County officials wrote in a Nov. 10 letter to the state Air Resources Board.The vast majority of landfills are already required to monitor for leaks and operate a gas collection system — a network of wells that extend deep into the layers of buried waste to capture and destroy methane.A hot messChiquita Canyon Landfill in Castaic has become the poster child for the issues plaguing California’s waste management system.A blistering-hot chemical reaction began inside the landfill’s main canyon in May 2022, roasting garbage in a roughly 30-acre area.Starting in April 2023, residents of Castaic and nearby Val Verde began to take notice. They called in thousands of odor complaints to the South Coast Air Quality Management District, with many citing headaches, nausea, nosebleeds and difficulty breathing.Later that year, state regulators learned that the landfill’s temperatures had risen above 200 degrees, melting plastic pipes used to collect landfill gases. An air district inspector also witnessed geysers of liquid waste bursting onto the surface and white smoke venting from large cracks spreading across the reaction area.Air sampling found elevated levels of lung-aggravating sulfur pollutants and cancer-causing benzene. Air samples in 2023 detected benzene concentrations more than eight times higher than the state’s short-term health limit at Hasley Canyon Park, which abuts Live Oak Elementary School, alarming local parents.“I personally have transferred my children to different schools further away,” said Jennifer Elkins, a Val Verde resident whose children attended Live Oak. “I spend three hours a day driving my kids to and from school. The commute has been a sacrifice, but it’s also been well worth it, because I know my children are breathing cleaner air, and I have seen their health improve.”The landfill, owned by Texas-based Waste Connections, installed new heat-resistant equipment to extract liquid waste in an attempt to reduce broiling temperatures. It also installed a large covering over the affected area to suppress odors. It permanently closed and ceased accepting waste this year.Still, the reaction area has tripled in size and could consume the entire 160-acre canyon for many more years. During other underground landfill fires, elevated temperatures have persisted for more than a decade.The issue is, once these broiling temperatures start consuming landfill waste, there’s little that landfill operators can do to snuff them out.The fumes from Chiquita Canyon have pushed some longtime residents to consider moving. After more than 25 years in Val Verde, Abigail DeSesa is contemplating starting anew somewhere else.“This is our life’s investment — our forever home that we were building for retirement and on the verge of paying off,” DeSesa said. “And we may have to start over.”“I don’t know that I can outlast it,” DeSesa added.Chiquita Canyon is not alone.Earlier this year, the South Coast air district learned about another fiery chemical reaction brewing inside El Sobrante Landfill in Corona. In August, Waste Management, the landfill’s owner and operator, acknowledged there was a two-acre “area of concern” where landfill staff had observed temperatures climbing above 200 degrees. Riverside County inspectors also found several fires had ignited on the landfill’s surface in recent years, according to public records.Environmental advocates fear that many more landfills may be on the precipice of these largely unmanageable disasters.According to an analysis by California Communities Against Toxics, there are 18 landfills in California that have had prolonged heat signatures detected by NASA’s Fire Information for Resource Management System, an online tool using satellite instruments to detect fires and thermal anomalies.At least 11 of these landfills requested and received permission from either federal or local environmental regulators to continue operating with higher temperatures than currently allowed, according to public records obtained by the environmental organization.These regulatory exemptions are part of the problem, said Jane Williams, the group’s executive director.“We have 11 landfills across California that have been granted waivers by the government to basically ‘hot rod’ the landfill,” Williams said. “We would really like EPA and state agencies to stop granting landfill waivers. It’s a permission slip to speed in a school zone.”Under newly proposed revisions to state rules, operators must be more transparent in disclosing the temperatures in their gas collection systems. If operators detect elevated temperatures, they must take action to minimize the amount of oxygen in the landfill.While these rule changes might be coming too late to fix the issues near Chiquita Canyon, locals hope it will help others who live in the orbit of the nearly 200 other large landfills in California that could be subject to these rules.“While there’s still a fight here to try to address the concerns at Chiquita Canyon Landfill, we know that there’s an opportunity to really prevent this kind of disaster from happening anywhere else in our state,” said Assemblymember Pilar Schiavo.Dangerous leaksMeanwhile, many other landfills are releasing unsafe amounts of methane, an odorless gas produced by bacteria that break down organic waste.These emissions present two critical issues.First, methane is a powerful greenhouse gas — capable of warming the atmosphere 80 times more than the same amount of carbon dioxide over 20 years. Following California’s large dairy and livestock operations, landfills emit the second-most methane statewide.Second, methane is the primary constituent in natural gas. It can ignite or explode at certain concentrations, presenting a serious safety risk in the event of uncontrolled releases. Several times over the last few years, regulators have detected potentially explosive concentrations in the air and shallow soil near several landfills.Under current landfill regulations, operators are required to monitor for excessive methane leaks four times a year. Many operators hire contractors to walk across accessible portions of the landfill with a handheld leak-monitoring device, an approach that some environmental advocates say is unreliable.In addition, some areas of the landfill are not screened for methane leaks if operators consider them to be unsafe to walk across, due to, for example, steep hills or ongoing construction activities.“Landfills have to monitor surface emissions, but they do that in a very inefficient way, using outdated technology,” Magavern said.Starting this past summer, California has partnered with the nonprofit organization Carbon Mapper to use satellites to detect methane leaks, and already has found 17 coming from landfills. In one case, researchers saw a large methane plume appear to emanate from Newby Island Landfill in San José and drift into a nearby residential neighborhood.Although the state has notified these landfill operators, it currently cannot require them to repair leaks detected via satellite. That would change under the proposed amendments to the state’s landfill regulations. Operators would also have to use state-approved technology to routinely scan portions of their landfills they deem inaccessible.The proposed amendments seek to prevent the most common causes of methane emissions. A series of surveys of landfill operators found 43% of leaks in recent years were caused by one or more of a facility’s gas collection wells being offline at the time.The new rules would require that such wells can only be offline for up to five days at a time for repairs. Operators would also be required to install gas collection systems within six months of when garbage is first placed in a new part of a landfill — rather than the 18-month time frame currently allowed.In addition, landfills would be forced to take actions to fix a leak within three days of detection, rather than 10 days. In theory, that should help reduce the risk of leaks from things like cracks in landfill covers (typically a layer of soil or plastic covering) and damaged components of gas collection systems — two other major sources of leaks that landfill operators have reported.The amended landfill rules could collectively cost private companies and local governments $12 million annually.Some say that’s well worth the cost.A contingent of residents who live near Chiquita Canyon Landfill are flying to Sacramento to attend the state Air Resources Board meeting. They are expected to testify on how the fire and landfill emissions have unraveled the fabric of the semi-rural community.Elkins, the Val Verde resident, appreciated the area’s natural beauty — picturesque hillsides, wildlife and opportunities for stargazing without bright city lights. However, now her family hardly spends any time outdoors due to the noxious odors.Some of her neighbors have moved away, but Elkins and many other longtime locals cannot, no matter how they fear for their health and safety. “The homes are not selling,” she said. “Other homes sit vacant, and community members are paying two mortgages just to get away. And for many of us, it would be financial suicide to move away and start over somewhere new.”

New Texas petrochemical facilities are mostly in low income areas, communities of color, study finds

Researchers evaluated the neighborhoods around 89 proposed or expanding petrochemical facilities across the state using a screening tool from the EPA.

Environment Researchers evaluated the neighborhoods around 89 proposed or expanding petrochemical facilities across the state using a screening tool from the EPA. David J. Phillip/APThis aerial photo shows the TPC petrochemical plant near downtown Houston, background, on Tuesday, Aug. 29, 2017. (AP Photo/David J. Phillip)A recent report from Texas Southern University found that new and expanding petrochemical facilities in Texas are overwhelmingly located in low-income neighborhoods and communities of color. Researchers evaluated the neighborhoods around 89 proposed or expanding petrochemical facilities across the state using a screening tool from the Environmental Protection Agency. They looked at air pollution and proximity to other "hazardous facilities" in the areas. Data related to the race, education, income level and languages within the areas was also collected. Sign up for the Hello, Houston! daily newsletter to get local reports like this delivered directly to your inbox. "The communities that are on the fenceline are getting pollution and they also are getting poverty," said Robert Bullard, one of the study's authors. "And also, if you look at the infrastructures within those neighborhoods that have these facilities, they are of poor quality." The report found that 9 in 10 of the facilities are located in counties with "higher demographic vulnerability" – meaning they had more people of color, more low-income residents, or both, compared to the state and national averages. Over half of the new facilities were slated to be built in communities that have a higher proportion of people of color than the national average. Meanwhile, 30% of the facilities were slated to be built in areas with a poverty rate higher than the national average. "Segregation and racial redlining actually segregated pollution, and it segregated people," Bullard said. The analysis also found that the proposed facilities were being built in areas that are already struggling with air pollution. About 1 in 5 of the proposed facilities are located within the top 10% of areas nationwide with the highest amount of particulate matter pollution, and 46% of the new facilities are slated to be built within the top 10% of communities across the country with the highest amount of air toxins. The facilities were concentrated in 9% of Texas counties, with nearly half of them located in Harris County or Jefferson County.

Lead water pipes are a primary contributor to lead exposure in children, study says

A recent study published in Environmental Science and Technology found a strong association between the presence of lead service lines (LSLs) and children’s elevated blood lead levels in Cincinnati, OH and Grand Rapids, MI. In short:While many factors can contribute to lead exposure, the prevalence of lead pipes was a stronger predictor of elevated lead levels than standard risk predictors used by the U.S. Environmental Protection Agency (EPA) and the Housing and Urban Development Department (HUD).For both cities, the prevalence of lead pipes was linked to the percentage of housing built before the 1950s, highlighting that lead pipes are more commonly found in older homes.Key quote:“These findings suggest that replacing LSLs is an effective public health strategy to eliminate this important source of [lead] exposure.”Why this matters:Lead is an incredibly toxic chemical that’s been linked to cardiovascular disease, cognitive impairment, damage to the reproductive and nervous systems, and more. While significant progress has been made in reducing the average blood lead levels in the U.S. over time, hotspots of elevated exposure still remain. Communities that suffer from higher lead levels are often faced with multiple potential sources of exposure, which is commonly paired with significant economic and social inequality in comparison to areas with lower exposures. Because the results of this study point to lead service lines as key contributors to lead exposures, the authors emphasize that federal programs that fund the replacement of these pipes are an effective and meaningful strategy for protecting public health.Related EHN coverage:Federal housing programs linked to lower levels of lead exposureUS lead pipe replacements stoke concerns about plastic and environmental injusticeMore resources:LISTEN: Agents of Change in Environmental Justice podcastSabah Usmani on making cities healthy and justNsilo Berry on making buildings healthierDiana Hernández on housing and healthTornero-Velez, Rogelio et al. for Environmental Science and Technology vol. 59, 43. Oct. 21, 2025

A recent study published in Environmental Science and Technology found a strong association between the presence of lead service lines (LSLs) and children’s elevated blood lead levels in Cincinnati, OH and Grand Rapids, MI. In short:While many factors can contribute to lead exposure, the prevalence of lead pipes was a stronger predictor of elevated lead levels than standard risk predictors used by the U.S. Environmental Protection Agency (EPA) and the Housing and Urban Development Department (HUD).For both cities, the prevalence of lead pipes was linked to the percentage of housing built before the 1950s, highlighting that lead pipes are more commonly found in older homes.Key quote:“These findings suggest that replacing LSLs is an effective public health strategy to eliminate this important source of [lead] exposure.”Why this matters:Lead is an incredibly toxic chemical that’s been linked to cardiovascular disease, cognitive impairment, damage to the reproductive and nervous systems, and more. While significant progress has been made in reducing the average blood lead levels in the U.S. over time, hotspots of elevated exposure still remain. Communities that suffer from higher lead levels are often faced with multiple potential sources of exposure, which is commonly paired with significant economic and social inequality in comparison to areas with lower exposures. Because the results of this study point to lead service lines as key contributors to lead exposures, the authors emphasize that federal programs that fund the replacement of these pipes are an effective and meaningful strategy for protecting public health.Related EHN coverage:Federal housing programs linked to lower levels of lead exposureUS lead pipe replacements stoke concerns about plastic and environmental injusticeMore resources:LISTEN: Agents of Change in Environmental Justice podcastSabah Usmani on making cities healthy and justNsilo Berry on making buildings healthierDiana Hernández on housing and healthTornero-Velez, Rogelio et al. for Environmental Science and Technology vol. 59, 43. Oct. 21, 2025

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