The EPA plans to repeal its landmark finding that greenhouse gas emissions endanger public health, and to rescind its greenhouse gas emissions standards for all motor vehicles.

The move could make it harder for California to achieve its climate goals, particularly because greenhouse gas emissions and their effects do not stop at state lines.

However, experts say it may also open the door for California to set even more aggressive policy.

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

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