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The article reports that U.S. President Donald Trump's administration has drafted a new proposal to regulate carbon dioxide emissions from coal-fired power plants, one that is far less stringent than the climate plan finalized in 2015 by former President Barack Obama.

The article looks at climate change policy in the U.S., discussing the opposition of many Republicans in the U.S. Congress to U.S. President Barack Obama's proposal for a pollution trading scheme to reduce carbon dioxide emissions, called cap and trade. It suggests this opposition is ironic, as Republicans have typically espoused market-based solutions to problems in lieu of government regulation.

The article discusses United States president Barack Obama's use of the U.S. Clean Air Act to implement environmental regulations, highlighting Obama's potential long-term environmental legacy. Topics addressed include the U.S. Environmental Protection Agency's (E.P.A.'s) powers under the Clean Air Act, Obama's policies aimed at reducing carbon dioxide emissions from coal-fired power plants and automobiles in an effort to mitigate global warming, and Republican opposition to Obama's policies.