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Trump Climate Policy Rollbacks
Coverage from CityNews Halifax, Kleinman Center for Energy Policy, and others
The Trump administration’s climate and environmental agenda includes efforts to reduce federal regulation, alter environmental programs and funding, and retreat from international climate governance.
A central example is the EPA’s rescission of the 2009 greenhouse-gas Endangerment Finding, which had supported Clean Air Act regulation of vehicle and other emissions. The changes have prompted disputes over statutory authority, climate and public-health risks, and the role of federal agencies, while states, advocacy groups, and others pursue legal and policy responses.
Looking Back
470 Day Timeline
Apr '25
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All Articles85 articles
Important
The Trump administration announced in Washington that EPA will rescind the 2009 greenhouse gas endangerment finding at a White House ceremony in February 2026.
2/10/2026 • Policy, Politics & Governance • General
In the United States, the Trump Administration moves to repeal the EPA Endangerment Finding after a DOE-commissioned climate contrarian report, amid lawsuits and scientific criticism.
5/26/2026 • Policy, Politics & Governance • General
EPA explains Clean Air Act-based greenhouse gas reporting and performance standards for U.S. vehicles and power plants, including FLIGHT data and 2022 inventory totals.
5/23/2026 • Policy, Politics & Governance • General
U.S. policy change on April 20 removed the 2009 endangerment finding basis for EPA greenhouse-gas regulation, prompting lawsuits and raising public-health and emissions concerns.
5/14/2026 • Policy, Politics & Governance • General
The United States formally left the Paris Climate Agreement for a second time in 2026, reversing prior reentry and prompting renewed debate over global climate commitments.
1/30/2026 • Policy, Politics & Governance • General
Trump and Zeldin announce repeal of endangerment finding at the White House on February 12 2026, affecting US greenhouse gas regulation.
2/12/2026 • Policy, Politics & Governance • General
In the United States, legal and scientific experts assess recent DOE and NAS climate reviews to evaluate whether repealing EPA's Endangerment Finding aligns with established evidence on human-caused warming.
2/13/2026 • Climate Science & Impacts • General
Chesapeake Bay Foundation litigation director Ariel Solaski says a lawsuit will challenge a federal rule blocking EPA regulation of vehicle greenhouse gas pollution in the U.S. Court of Appeals for the D.C. Circuit.
4/29/2026 • Policy, Politics & Governance • General
On February 12, 2026, the U.S. Environmental Protection Agency in Washington, D.C., rescinded the 2009 Endangerment Finding and federal motor-vehicle greenhouse gas standards.
2/17/2026 • Policy, Politics & Governance • General
The Trump administration finalized repeal of the 2009 EPA endangerment finding on Thursday in the United States, eliminating a key legal basis for federal greenhouse gas regulation and prompting lawsuits.
2/13/2026 • Policy, Politics & Governance • General
EPA administrator Lee Zeldin announced on behalf of the EPA in Washington, D.C., that the agency finalized rescinding the 2009 GHG endangerment finding under the Clean Air Act.
2/12/2026 • Policy, Politics & Governance • General
Trump administration on February 12, 2026 moves to rescind 2009 endangerment finding, shifting climate health policy in the United States.
2/12/2026 • Climate Science & Impacts • General
President Donald Trump and EPA Administrator Lee Zeldin announce in 2025 a final rule repealing federal GHG vehicle standards in the United States to reduce regulatory burden and return policy decisions to Congress.
2/12/2026 • Policy, Politics & Governance • General
President Trump and EPA Administrator Lee Zeldin will rescind the 2009 endangerment finding in Washington, D.C., eliminating the legal basis for many U.S. greenhouse gas regulations.
2/11/2026 • Policy, Politics & Governance • General
On February 10, 2026, the Trump administration in Washington, D.C., announced plans for EPA to rescind its 2009 greenhouse gas endangerment finding.
2/10/2026 • Policy, Politics & Governance • General
IPCC responds to United States withdrawal on January 8 2026 with commitment to ongoing Seventh Assessment Report work and methodology reports.
2/2/2026 • Policy, Politics & Governance • General
Since Donald Trump’s 2024 reelection, EPA leaders in Washington have weakened oversight bodies and data reporting that once scrutinized U.S. air and climate regulations.
1/28/2026 • Policy, Politics & Governance • General
The EPA is finalizing a 2025 rule in Washington, D.C., to repeal the 2009 endangerment finding that underpins federal greenhouse gas regulations for vehicles and other sectors.
1/16/2026 • Policy, Politics & Governance • General
E&E News in 2026 profiles 18 Trump administration energy and environmental officials in Washington who are steering a fossil-fuel-focused, deregulatory agenda that weakens prior climate and electrification policies.
1/14/2026 • Policy, Politics & Governance • General
The United States, under President Donald Trump, formally left the Paris Agreement and key UN climate bodies in 2025, alarming international climate and energy experts.
4/8/2025 • Policy, Politics & Governance • General
The Trump administration announced repeal of the 2009 Endangerment Finding in the United States, prompting criticism from Barack Obama and climate groups over weakened greenhouse gas regulation.
2/14/2026 • Policy, Politics & Governance • General
The U.S. administration moved on Feb 12, 2026 to rescind the 2009 endangerment finding, challenging evidence that greenhouse gases endanger public health across the United States.
2/13/2026 • Climate Science & Impacts • General
The Trump administration announced on Thursday in Washington that it is rescinding the 2009 EPA endangerment finding, removing federal legal authority to regulate greenhouse gases in the USA.
2/12/2026 • Policy, Politics & Governance • General
The Trump administration revoked the EPA endangerment finding and rescinded federal vehicle tailpipe standards on Feb 12 in Washington, prompting industry comment and planned environmental lawsuits.
2/12/2026 • Policy, Politics & Governance • General
The Trump administration on February 12, 2026 revoked the EPA's 2009 greenhouse gas endangerment finding in Washington, prompting immediate legal threats from California and allied states.
2/12/2026 • Policy, Politics & Governance • General
In Washington, D.C., the Trump administration is preparing to revoke EPA’s greenhouse gas endangerment finding, reshaping federal climate authority and triggering anticipated court challenges.
2/11/2026 • Policy, Politics & Governance • General
EPA enforcement actions against polluters in 2025 fall, while deregulation plans signal heat pump deployment policy implications in the United States.
2/5/2026 • Policy, Politics & Governance • General
The Guardian reports from the United States that Donald Trump's EPA, in 2025–2026, is rolling back dozens of federal air, water, chemical, and climate regulations.
1/30/2026 • Policy, Politics & Governance • General
In February 2026 in Washington, President Donald Trump repealed the EPA greenhouse gas endangerment finding and Biden-era vehicle emissions standards, reshaping U.S. transport climate policy.
2/13/2026 • Clean Energy & Emissions • General
EPA in 2025 proposed revisions to weaken Risk Management Program protections for hazardous chemical facilities after removal of a public hazard data tool.
4/14/2026 • Adaptation & Resilience • General
Interesting
Aaron Szabo will leave the US EPA Office of Air and Radiation, following regulatory rollback actions including rescinding the 2009 greenhouse-gas endangerment finding.
7/7/2026 • Policy, Politics & Governance • General
Lee Zeldin leads EPA actions to repeal the 2007 endangerment finding as states such as California challenge the move in court amid U.S. climate governance rollbacks.
5/8/2026 • Policy, Politics & Governance • General
On February 12, 2026, EPA finalized rescission of the Endangerment Finding, removing Clean Air Act authority for greenhouse-gas regulation amid reported EPA research and workforce rollbacks.
5/5/2026 • Policy, Politics & Governance • General
California Governor Gavin Newsom criticized the Trump administration in 2026 over a planned repeal of the EPA Endangerment Finding, prompting a state lawsuit in response.
4/20/2026 • Policy, Politics & Governance • General
The Trump Administration reversed the Obama era endangerment finding in the United States, eliminating vehicle greenhouse gas standards and raising climate and public health concerns.
4/8/2026 • Policy, Politics & Governance • General
On March 30, Harvard alumni and experts discussed how EPA repeal of the 2009 Endangerment Finding on February 12 affects U.S. Clean Air Act authority for greenhouse-gas regulation as state litigation grows.
4/2/2026 • Policy, Politics & Governance • General
U.S. government plans to repeal the Clean Air Act basis for EPA greenhouse gas regulation are framed against IPCC evidence on climate-driven extreme heat, wildfire smoke, and hurricanes.
3/31/2026 • Policy, Politics & Governance • General
EPA proposed rolling back the 2009 endangerment finding for vehicle greenhouse-gas regulation in August 2025, triggering multi-state lawsuits and potentially Supreme Court review.
3/25/2026 • Policy, Politics & Governance • General
In 2020s litigation, U.S. states and local governments sued EPA to block rescission of the 2009 greenhouse gas Endangerment Finding under Trump administration actions.
3/23/2026 • Policy, Politics & Governance • General
US health and environmental groups sue EPA after the Trump administration withdraws the 2009 greenhouse gas endangerment finding tied to public health and environmental regulation.
3/20/2026 • Policy, Politics & Governance • General
Cities and counties filed a Clean Air Act lawsuit against EPA over repeal of the 2009 endangerment finding, effective April 20.
3/20/2026 • Policy, Politics & Governance • General
Led by California, Connecticut, Massachusetts, and New York attorneys general, states and cities filed a legal challenge in response to the EPA February revocation of the Endangerment Finding.
3/19/2026 • Policy, Politics & Governance • General
Twenty-four states and local governments filed a D.C. Circuit lawsuit in 2025 challenging an EPA February rescission of the 2009 endangerment finding underpinning U.S. greenhouse-gas rules.
3/19/2026 • Policy, Politics & Governance • General
Mary Rice explains what the endangerment finding is, when revocation occurred, where EPA authority is affected, and why health protections depend on climate policy.
2/24/2026 • Policy, Politics & Governance • General
EPA rolls back endangerment finding; environmental groups sue in North Carolina in 2026.
2/18/2026 • Policy, Politics & Governance • General
On Feb. 12, 2026, the US Environmental Protection Agency revoked its greenhouse-gas endangerment finding in Washington, DC, sparking legal challenges and alarm among climate scientists.
2/18/2026 • Policy, Politics & Governance • General
President Donald Trump and EPA administrator Lee Zeldin rescinded the 2009 endangerment finding on Thursday in the United States, removing the legal basis for many federal greenhouse gas regulations.
2/13/2026 • Policy, Politics & Governance • General
President Donald Trump and EPA Administrator Lee Zeldin rescinded the 2009 endangerment finding in Washington in February 2026, removing the legal basis for several U.S. greenhouse gas regulations.
2/12/2026 • Policy, Politics & Governance • General
Trump repeals endangerment finding 2026
2/12/2026 • Policy, Politics & Governance • General
In January and February 2026 in the United States, the Trump administration moved to revoke the EPA endangerment finding and exit key UN climate agreements.
2/11/2026 • Policy, Politics & Governance • General
The administration will revoke the 2009 endangerment finding this week in Washington, removing the legal basis for many U.S. climate regulations and likely triggering lawsuits.
2/10/2026 • Policy, Politics & Governance • General
In January 2025, the Trump administration shut down EPA Office of Research and Development climate and environmental justice projects, after firing epidemiologist Thomas Luben.
6/17/2026 • Policy, Politics & Governance • General
Health and environmental groups petition EPA to reopen a rule repealing the Endangerment Finding supporting U.S. motor vehicle climate pollution standards.
4/16/2026 • Policy, Politics & Governance • General
EPA rescinded the 2009 greenhouse-gas endangerment finding on February 12, with repeal effective April 20, prompting D.C. Circuit lawsuits and demonstrations in San Francisco.
4/15/2026 • Policy, Politics & Governance • General
Donald Trump unveiled a 2027 U.S. budget proposal that increases defense spending while cutting EPA and NOAA funding and reducing EV, climate, and environmental programs.
4/2/2026 • Policy, Politics & Governance • General
On February 12, 2026, EPA repealed the 2009 Greenhouse Gas Endangerment Finding, and states filed suit in the D.C. Circuit on March 19, 2026.
3/23/2026 • Policy, Politics & Governance • General
Massachusetts, California, New York, and Connecticut, representing 24 states and local governments, sued EPA in the D.C. Circuit in 2020s over the February rescission of the 2009 endangerment finding.
3/19/2026 • Policy, Politics & Governance • General
Twenty-four states plus cities and counties sued EPA in the D.C. Circuit to challenge the repeal of the 2009 endangerment finding underpinning Clean Air Act greenhouse-gas rules.
3/19/2026 • Policy, Politics & Governance • General
White House policy move rescinds the 2009 endangerment finding for greenhouse gases on February 12 2026 in the United States.
2/25/2026 • Climate Science & Impacts • General
Senate Democrats in 2026 opened an investigation into the U.S. EPA’s decision to end monetized health benefit estimates for ozone and PM2.5 regulations nationwide.
2/17/2026 • Policy, Politics & Governance • General
US withdraws from UNFCCC and Paris Agreement in 2026, weakening international climate governance and prompting questions about future reentry.
1/28/2026 • Policy, Politics & Governance • General
Inside Climate News, interviewing journalist Marianne Lavelle in January 2026, describes how Trump administration plans to leave climate treaties could reshape global policy, trade, and climate science participation.
1/18/2026 • Policy, Politics & Governance • General
Food & Water Watch and Alaskan tribes sued the Trump administration after repeal of the EPA greenhouse-gas endangerment finding and motor vehicle climate pollution standards.
5/15/2026 • Policy, Politics & Governance • General
United States administration repeals Endangerment Finding on February 12 2026 in the United States.
2/23/2026 • Policy, Politics & Governance • General
Amnesty International details in a 2020s blog post how President Donald Trump’s administration is dismantling U.S. and international frameworks for coordinated global climate action.
2/6/2026 • Policy, Politics & Governance • General
Wyoming and Texas senators backed an EPA greenhouse gas endangerment rollback as health and environmental groups challenged the reversal in the U.S. D.C. Circuit.
4/15/2026 • Policy, Politics & Governance • General
Letitia James and a multistate coalition asked the U.S. Court of Appeals for the District of Columbia Circuit to block an EPA hydrofluorocarbon rule weakening refrigeration compliance deadlines.
7/21/2026 • Policy, Politics & Governance • General
Senate Democrats questioned EPA Administrator Lee Zeldin in a Senate committee hearing in Washington in response to a proposed $4.2 billion EPA budget cut and related climate regulatory rollbacks.
4/29/2026 • Policy, Politics & Governance • General
Earthjustice and allied groups sued the EPA in the 2020s to overturn repeal of the 2009 greenhouse-gas endangerment finding supporting motor-vehicle emissions standards, citing Clean Air Act authority and Massachusetts v. EPA.
4/8/2026 • Policy, Politics & Governance • General
Andrea Campbell and 24 states petition the D.C. Circuit to review EPA rescission of the 2009 Endangerment Finding supporting federal motor vehicle greenhouse gas standards.
3/22/2026 • Policy, Politics & Governance • General
The EPA revoked the 2009 greenhouse gas endangerment finding in 2025, risking higher pollution and health harms in U.S. frontline communities like Louisiana's Cancer Alley.
2/20/2026 • People & Justice • General
Almeta Cooper warned in February that EPA repeal of an endangerment finding could weaken Clean Air Act climate pollution regulation and worsen children's health, especially in Black and Brown communities.
6/10/2026 • Policy, Politics & Governance • General
EPA Office of Research and Development staffing changes affecting climate and public health research drew criticism and defense amid lab closures and reassignment.
4/28/2026 • Policy, Politics & Governance • General
EPA Administrator Lee Zeldin promoted repeal of the EPA endangerment finding in Washington at a climate-skeptic conference in 2020s, as 24 states challenged the change in federal court.
4/8/2026 • Policy, Politics & Governance • General
Trump fiscal 2027 budget request proposes major cuts to EPA, NOAA, and FEMA programs while reducing renewable energy support and eliminating LIHEAP.
4/6/2026 • Policy, Politics & Governance • General
Letitia James and a coalition of 40 Democratic states and localities filed in the US DC Circuit after the Trump administration ended the EPA endangerment finding for greenhouse-gas regulation.
3/19/2026 • Policy, Politics & Governance • General
EPA Administrator Lee Zeldin defended repeal of the 2009 endangerment finding at a Heartland Institute conference in Illinois, amid criticism and legal challenges over Clean Air Act greenhouse gas rules.
4/8/2026 • Policy, Politics & Governance • General
EPA rescinded the 2009 endangerment finding in February, and Resources for the Future will quantify health, environmental, and economic effects of resulting vehicle and power-sector greenhouse gas rule rollbacks.
7/14/2026 • Policy, Politics & Governance • General
US EPA greenhouse-gas endangerment-finding rescission efforts, announced in February, face lawsuits and underscore ongoing climate policy instability amid lack of comprehensive legislation.
4/1/2026 • Policy, Politics & Governance • General
Natural Resources Council of Maine joined a coalition lawsuit in March 2026 challenging EPA rollbacks to coal-plant mercury standards and real-time emissions monitoring affecting downwind communities.
3/29/2026 • Policy, Politics & Governance • General
Additional
Robert Farber argues the Trump Administration used exaggerated scientific uncertainty to justify EPA regulatory rollbacks affecting climate and air-pollution safeguards.
7/9/2026 • Policy, Politics & Governance • General
EPA Administrator Lee Zeldin defended the Trump administration repeal of the 2009 greenhouse-gas endangerment finding at the Heartland Institute conference in Washington, D.C., while court challenges continued.
4/8/2026 • Policy, Politics & Governance • General
EPA Administrator Lee Zeldin defended the repeal of the 2009 endangerment finding at a Heartland Institute event, with lawsuits filed by states and environmental groups.
4/8/2026 • Policy, Politics & Governance • General
EPA Administrator Lee Zeldin opened a Heartland Institute climate conference on Wednesday by citing repeal of the 2009 greenhouse gas endangerment basis for U.S. emissions regulation.
4/8/2026 • Policy, Politics & Governance • General
EPA finalized a February 12, 2026 rule overturning the Endangerment Finding in the USA amid allegations of improper interference with National Climate Assessment drafting.
3/24/2026 • Policy, Politics & Governance • General