Scott Pruitt's comments on carbon dioxide come just over two weeks after he took the helm of the Environmental Protection Agency, the agency with the authority to regulate CO2 and other greenhouse gases as pollutants.
Oklahoma Attorney General Scott Pruitt, shown in 2013, is President-elect Donald Trump's pick to head the EPA. Pruitt's outspoken criticism of climate change and his close ties to the energy industry have raised concerns about his ability to lead the agency.
Orange sediment laced with heavy metals is visible in the path of water coming out of the Natalie/Occidental Mine in southwestern Colorado. This mine is one of dozens on a proposed Superfund listing pending with the EPA. Several mines in the area have been leaching the tainted water for years — well before the Gold King Mine spill.
Grace Hood/Colorado Public Radio
The logo of German automaker Volkswagen AG can be seen on an administrative building at the Volkswagen factory on the day of the company's annual press conference on April 28 in Wolfsburg, Germany.
Sean Gallup/Getty Images
The village of Hoosick Falls, N.Y., sits along the Hoosick River in eastern New York. Elevated levels of a suspected carcinogen known as PFOA were found in the village's well water, which is now filtered.
Hansi Lo Wang/NPR