He's called EPA regulations "coercion" and has fought to slow down the move away from fossil fuels.
Donald Trump has tapped Oklahoma Attorney General Scott Pruitt to head the Environmental Protection Agency.
Pruitt has a long history with the EPA, but it's not a friendly one.
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Pruitt has argued against environmental regulations and played a role in the 28-state lawsuit against President Obama following his new effort to cut carbon emissions.
Pruitt has called the EPA a "byzantine regulatory regime." He's also called any antagonism toward climate change nonbelievers "un-American."
Addressing climate change is one of the EPA's top priorities. But conservatives like Pruitt have accused the agency of federal overreach.
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"We believe that is a form of coercion by the EPA, forcing the states to take action — to do what? Accomplish the shifting of electricity generation to other sources," Pruitt said during a Federalist Society panel discussion.
Trump's pick has been denounced by progressives as a step backward in the fight against climate change.