Brian Barton
During his presidency, Donald Trump proposed and implemented several policies that reversed or weakened existing pollution controls. Trump's administration targeted pollution controls on vehicles, including rules that required automakers to build more efficient and cleaner vehicles, as well as California's ability to set its own stricter standards. Trump's Environmental Protection Agency (EPA) also moved to rescind the finding that greenhouse gas emissions endanger human health, which was the legal basis for many climate regulations. Other rollbacks include the Clean Water Rule, regulations on toxic waste from coal plants, and protections for Bristol Bay in Alaska. These changes have been criticized by environmental groups, legal experts, and public health professionals as detrimental to public health and the environment.
| Characteristics | Values |
|---|---|
| Clean Water Rule | Repealed |
| Pollution-control policies | Rewritten |
| Pollution standards for vehicles | Loosened |
| Zero-emission vehicle mandate in California | Revoked |
| CAFE standards | Defanged |
| Regulations to prevent toxic waste from coal plants entering the water supply | Reversed |
| Funding for Landscape conservation cooperatives (LCC) | Eliminated |
| EPA's pollution-control policies | Reversed |
| EPA's greenhouse gas rules | Gutted |
| EPA's tailpipe standards | Remain in place |
| EPA's endangerment finding | Proposed to be revoked |
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What You'll Learn
Trump's EPA claims climate pollution does not harm people
In 2025, the Trump administration proposed repealing a 2009 declaration that carbon dioxide and other greenhouse gases endanger public health and welfare. This "endangerment finding" is the legal basis for climate regulations under the Clean Air Act, which applies to motor vehicles, power plants, and other pollution sources that contribute to global warming. The proposal, announced by Environmental Protection Agency (EPA) Administrator Lee Zeldin, is expected to cut $54 billion in costs annually by removing all greenhouse gas standards, including vehicle tailpipe standards.
Trump's EPA claims that eliminating US carbon pollution will not have a measurable impact on the global climate or public health. This claim contradicts scientific evidence and the experiences of those facing the impacts of climate change, such as sea level rise, extreme heat, floods, and fires. By warming the planet and increasing the likelihood of extreme weather events, greenhouse gas emissions pose significant threats to society and human health.
The EPA's proposal is based on the argument that the Clean Air Act authorizes the agency to regulate only emissions that locally threaten health. This interpretation has been criticized by environmental groups, legal experts, and Democrats, who argue that the EPA is denying settled science and shirking its responsibility to protect public health and the environment. The move is expected to face legal challenges, with environmental groups confident in their chances of success.
In addition to targeting the endangerment finding, the Trump administration has also taken steps to roll back regulations that promote cleaner cars. The administration has asked Congress to revoke the EPA waiver that allows California to set its own zero-emission vehicle mandate, and Congress has removed fines for carmakers who fail to meet fuel efficiency standards. These changes reduce the incentive for automakers to build more efficient and less polluting vehicles.
The Trump administration has also granted exemptions to coal plants and chemical facilities, allowing them to avoid complying with clean air rules. These exemptions include waivers from restrictions on hazardous air pollutants such as mercury and ethylene oxide, posing risks to the health and safety of nearby communities.
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The endangerment finding, enshrined in 2009, is to be reversed
On July 29, 2025, the Trump administration announced its plan to rescind the "Endangerment Finding," a long-standing ruling that greenhouse gas emissions endanger human health. This move would remove the legal foundation for all US greenhouse gas regulations, threatening the health of families, communities, and future generations. The endangerment finding, enshrined in 2009, is a direct response to the US Supreme Court decision in Massachusetts v. EPA, which established that the EPA has the authority to regulate greenhouse gas emissions under the Clean Air Act. The finding recognizes that emissions from new motor vehicles contribute to pollution and pose a risk to public health and welfare.
The proposed reversal of the Endangerment Finding is part of a series of executive orders issued by the Trump administration targeting environmental protections. These orders aim to reduce costs and promote deregulation, but they come at the expense of public health and the environment. The endangerment finding has been a critical tool in holding industries accountable for their contributions to climate change and protecting communities from the harmful effects of pollution.
The Endangerment Finding is a prerequisite for regulating emissions from new motor vehicles and their engines. Without it, the EPA lacks the statutory authority to set standards for greenhouse gas emissions. As a result, vehicle and engine manufacturers would be exempt from measuring, controlling, and reporting their GHG emissions. This reversal aligns with the Trump administration's broader efforts to roll back environmental protections, such as loosening regulations for cleaner cars and revoking California's ability to set its own emission standards.
The potential consequences of reversing the Endangerment Finding are dire. It would mean more frequent and severe wildfires, hotter days detrimental to physical and mental health, increased flooding, and the exacerbation of existing disparities that disproportionately impact communities of color and those experiencing poverty. The scientific consensus is clear that greenhouse gases drive global warming and directly threaten human health. By undermining the Endangerment Finding, the Trump administration is prioritizing short-term economic gains over the well-being of current and future generations.
Environmental groups, states, and lawyers have vowed to challenge the proposed reversal, recognizing its potential devastating impact on the planet and public health. The move by the Trump administration is a significant setback in the fight against climate change and a denial of the urgent need to protect communities from the worsening effects of global warming.
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The Clean Water Rule has been repealed
The Clean Water Rule, which was enacted in 2015, has been repealed by the Trump administration. This rule clarified the scope of "waters of the United States" protected under the Clean Water Act (CWA). The CWA is the primary federal law regulating water pollution in the United States and ensuring safe drinking water. The Clean Water Rule was intended to make it easier to predict the actions of the Environmental Protection Agency (EPA) and the processes that companies and stakeholders may have to undergo for projects and permitting.
The Clean Water Rule was developed through a rigorous process that included peer-reviewed hydrological studies, interagency reviews, and economic analyses. It was informed by Supreme Court case law, scientific conclusions, and public input. The rule sought to protect specific watersheds and wetlands that impact downstream water health, such as the Texas coastal prairie wetlands and California's western vernal pools. It also aimed to involve minority, low-income, and indigenous populations in decision-making processes related to water protection.
By repealing the Clean Water Rule, the Trump administration has removed crucial protections for America's water resources. This repeal is part of a broader pattern of the administration's efforts to roll back environmental protections and regulations. For instance, the administration has also targeted greenhouse gas regulations by proposing to revoke the finding that greenhouse gas emissions endanger human health and welfare.
The repeal of the Clean Water Rule has significant implications for the nation's water quality and ecological integrity. It undermines the ability to protect upstream waters, headwaters, and wetlands, which are crucial for maintaining the health of downstream waters. The repeal also increases confusion and uncertainty for landowners and regulated entities regarding water protection standards and requirements.
The consequences of this repeal are likely to be far-reaching, impacting not only the environment but also public health and the economic and recreational activities that depend on clean water. It remains to be seen whether legal challenges or future administrations will seek to reinstate or replace the Clean Water Rule to safeguard America's water resources.
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The EPA's pollution-control policies have been rewritten
The EPAs pollution-control policies have been rewritten. In 2025, the Trump administration proposed revoking a scientific finding that has long been the basis for US action to regulate greenhouse gas emissions and fight climate change. The Environmental Protection Agency (EPA) Administrator Lee Zeldin announced the agency's plan to rescind the "endangerment finding", which stated that emissions from new motor vehicles contribute to pollution and endanger public health and welfare. This move would cut $54 billion in costs annually by repealing all greenhouse gas standards, including vehicle tailpipe standards.
The Trump administration has also taken steps to roll back regulations that push automakers to build more fuel-efficient and less polluting cars. They have asked Congress to revoke the EPA waiver that allows California, the first state to regulate vehicle emissions, to set its own rules for zero-emission vehicles. Additionally, Congress has removed fines for carmakers who fail to meet fuel efficiency standards, reducing the incentive to comply.
The EPA's proposed changes have been met with criticism from various sources. Environmental groups, legal experts, and Democrats argue that repealing the endangerment finding would be difficult and unlikely to succeed. They assert that it would put the lives of millions of Americans at risk and contradict the EPA's mission to protect the environment and human health. Environmental lawyers also warn that the new method will undermine the legal basis for controlling pollutants like mercury.
Furthermore, the Trump administration has reversed the Obama administration's decision against a proposed Alaska mining operation, Pebble Mine in Bristol Bay, which was found to permanently harm the region's sockeye salmon fisheries. The administration has also eliminated funding for Landscape Conservation Cooperatives (LCCs), which are research centers addressing issues such as flooding, species extinction, and climate change. These actions align with Trump's statements during his campaign, where he expressed skepticism about global warming and criticized the Department of Environmental Protection.
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Trump's administration is attempting to unmake virtually all climate US regulations
In 2025, the Trump administration proposed revoking a scientific finding that has long been the basis for US action to regulate greenhouse gas emissions and fight climate change. The proposal, announced by Environmental Protection Agency (EPA) Administrator Lee Zeldin, would rescind a 2009 declaration that emissions from new motor vehicles contribute to pollution and endanger public health and welfare. This "endangerment finding" is the legal basis for climate regulations under the Clean Air Act for motor vehicles, power plants, and other pollution sources.
The Trump administration's proposal would effectively eliminate rules designed to promote cleaner cars and remove all regulations related to cutting greenhouse gas emissions from cars. This is in line with the administration's broader efforts to roll back environmental rules, including the Clean Water Rule, and undermine the legal underpinnings of controls on mercury and other pollutants. The administration has also targeted the EPA's ability to regulate greenhouse gases, citing a 2024 Supreme Court decision that reduced the power of federal agencies to interpret the laws they administer.
The move has been criticized by environmental groups, legal experts, and Democrats, who argue that it would be damaging to the environment and public health. They point to the ongoing effects of heat waves, fires, smog, and soot from vehicles made worse by climate change. The Environmental Defense Fund has repeatedly sued the Trump administration over changes that weaken environmental protections. David Konisky, a professor of public and environmental affairs, stated that the administration's actions are "less about mercury than about potentially constraining or handcuffing future efforts by the E.P.A. to regulate air pollution."
In addition to the above, the Trump administration has also reversed the Obama administration's decision against a proposed Alaska gold and copper mining operation, Pebble Mine in Bristol Bay. The Obama administration had found that a mine would permanently harm the region's sockeye salmon fisheries. The Trump administration's reversal was described by the Washington Post as typical of the administration's "whiplash" decisions, which have "dismantled many of his predecessor's actions on climate change, conservation, and pollution."
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Frequently asked questions
The Endangerment Finding is a 2009 order from then-President Barack Obama that allowed the US Environmental Protection Agency (EPA) to create rules to limit pollution by setting emissions standards.
Trump has been trying to overturn the Endangerment Finding since 2024, when he suggested oil executives should raise $1 billion for his presidential bid because he would roll back environmental rules.
The EPA claims that eliminating climate pollution from these facilities would have little effect on people's health.
Trump has reversed rules limiting mercury and air toxins from power plants, limiting water pollution from coal plants, banning the pesticide chlorpyrifos, and banning methane emissions from landfills.
The Clean Water Rule is an Obama-era rule that protects water sources from industrial and agricultural waste, sewage, radioactive materials, and other pollutants. Trump repealed this rule in 2017.
