Last mentioned: Mar 21, 2026
Multi-State Lawsuit Filed
24 states and 10 cities sue to block the repeal in federal court.
Multi-State Lawsuit Filed
24 states and 10 cities sue to block the repeal in federal court.
State Coalition Lawsuit
US states file a joint lawsuit to block the EPA's repeal in federal court.
EPA Repeals Finding
The agency formally rescinds the 2009 determination.
EPA Repeal Announcement
The Trump EPA formally moves to rescind the 2009 Endangerment Finding.
EPA Repeals Finding
The agency formally rescinds the 2009 determination.
En Banc Hearing
The full D.C. Circuit Court rehears the case, questioning the EPA's shifting justifications.
Current Rollback
The EPA announces a new rule to weaken limits, citing industry economic relief.
Initial Panel Ruling
A three-judge panel rules that the administration has broad power to cancel the contracts.
Trump EPA Freeze
The incoming Trump administration freezes the $20 billion fund, alleging waste and fraud.
Standards Strengthened
The Biden administration restores and tightes mercury limits to record levels.
GGRF Authorization
The Biden administration authorizes $20 billion for the Greenhouse Gas Reduction Fund.
Cost-Benefit Revision
The EPA under the Trump administration weakens the legal justification for the rule.
MATS Established
The Obama administration issues the first national standards for mercury emissions from power plants.
Endangerment Finding Issued
EPA formally determines GHGs threaten public health and welfare.
Endangerment Finding Issued
EPA officially finds that six greenhouse gases threaten public health.
Endangerment Finding Issued
EPA officially finds that six greenhouse gases threaten the health of current and future generations.
Massachusetts v. EPA
Supreme Court rules GHGs are pollutants under the Clean Air Act.
Massachusetts v. EPA
Supreme Court rules EPA has authority to regulate GHGs if they endanger health.
Massachusetts v. EPA
Supreme Court rules EPA must regulate GHGs if they are found to endanger public health.
The Administrator of the Environmental Protection Agency is scheduled to headline an event hosted by an organization that denies the existence of a climate crisis. This move signals a significant shift in federal environmental policy and a potential departure from long-standing scientific consensus within the agency.
A coalition of US states has filed a high-stakes lawsuit against the Environmental Protection Agency to block the repeal of the 2009 Endangerment Finding. The legal challenge argues that the administration is ignoring established science to dismantle the foundation of federal greenhouse gas regulations.
A coalition of 24 states and 10 cities has filed a lawsuit against the EPA to block the repeal of the 2009 endangerment finding. The legal challenge argues that removing the scientific basis for greenhouse gas regulation is arbitrary and threatens public health.
A coalition of 24 states and 10 cities has filed a major lawsuit against the Environmental Protection Agency following its repeal of the 2009 greenhouse gas endangerment finding. The legal challenge aims to preserve the foundational authority for federal climate regulations under the Clean Air Act.
The U.S. Court of Appeals for the D.C. Circuit is reviewing the Trump administration's decision to terminate $20 billion in clean energy grants. Judges questioned the EPA's shifting justifications for the move, while also scrutinizing the nonprofits' claims to the funds following partial legislative repeals.
The Environmental Protection Agency has officially weakened mercury and air toxics standards for coal-fired power plants, reversing years of stringent environmental oversight. This regulatory pivot aims to reduce operational costs for the aging coal fleet but faces immediate backlash from public health advocates and environmental groups.