In a stunning move, the U.S. Environmental Protection Agency on Tuesday proposed to repeal its landmark 2009 finding that greenhouse gas emissions endanger public health. The proposal would also revoke the standards the agency has set for greenhouse gas emissions from all motor vehicles. The so-called endangerment finding is a formal determination affirming that planet-warming greenhouse gases such as carbon dioxide and methane pose a threat to human health and the environment. … If it is reversed, many standards that rely on it could crumble — leaving the auto industry and other polluting sectors free to emit greenhouse gases without limits. But experts and state regulators say it could also represent a golden opportunity for California to set a national example, as the move may open the door for stronger regulations at the state level.

Other greenhouse gas regulation news:

• San Francisco Chronicle: EPA moves to undo key climate rule; California vows to fight back
• Grist: Trump’s EPA is attacking its own power to fight climate change
• The Desert Sun (Palm Springs, Calif.): EPA climate rollback threatens California clean air protections
• The New York Times: In game-changing climate rollback, E.P.A. aims to kill a bedrock scientific finding
• The Packer: [Iowa] Sen. Ernst introduces bill to bring WOTUS certainty