Darren Baxt

At Trump's request, the Environmental Protection Agency repealed the 2009 finding that greenhouse gases endanger public health.

Darren Baxt of the Competitive Enterprise Institute says the Obama-era finding was illegal.

It is basically an excuse to regulate the economy and to reshape entire industries.

But without the endangerment finding, the government cannot limit climate pollution from cars, power plants, and the oil industry, says Harvard Law professor Jody Freeman.

Previous efforts to pass such climate legislation have failed.