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WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)

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    EPA head questions climate change

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EPA head questions climate change

Scott Pruitt, President Donald Trump's head of the US Environmental Protection Agency, claims that carbon dioxide is not the main cause of global warming.

EPA head questions climate change

Scott Pruitt, President Donald Trump's head of the US Environmental Protection Agency, claims that carbon dioxide is not the main cause of global warming.