If successful, the repeal could strip away the federal government’s most powerful way to control the country’s planet-warming pollution and fight climate change.

The Trump administration’s EPA is set to propose reversing the 2009 endangerment finding that classified carbon dioxide and other greenhouse gases as pollutants threatening human health, a move that could gut US climate regulations.

The Trump administration is trying to overturn the EPA's endangerment finding, which determined that greenhouse gas emissions can be regulated under the Clean Air Act. Lisa Heinzerling, former senior climate policy counsel to the EPA administrator,

The head of the Environmental Protection Agency moved to repeal a landmark environmental decision to regulate greenhouse gas emissions and fight climate change.

Administrator Lee Zeldin released a plan to dismantle the endangerment finding, a cornerstone of government authority over polluting industries.

The 2009 climate “endangerment finding” serves as the scientific and legal basis for many of EPA’s rules that limit greenhouse gas emissions from things like cars and coal plants. EPA administrator Lee Zeldin said reversing the finding would be the largest deregulatory action in the country’s history.