NASA chief says he changed mind about climate change because he 'read a lot’

NASA Administrator Jim BridenstineJames (Jim) Frederick BridenstineOvernight Energy: Outdoor retailer Patagonia makes first Senate endorsements | EPA withdraws Obama uranium milling rule | NASA chief sees 'no reason' to dismiss UN climate report NASA chief: ‘No reason to dismiss’ recent UN climate report Russian Soyuz rocket failure leaves NASA with no ride to International Space Station MORE says he changed his mind on the existence of man-made climate change because he “read a lot.”

“I heard a lot of experts, and I read a lot,” Bridenstine told The Washington Post on Tuesday. “I came to the conclusion myself that carbon dioxide is a greenhouse gas that we've put a lot of it into the atmosphere and therefore we have contributed to the global warming that we've seen. And we've done it in really significant ways.” 

The former congressman from Oklahoma had long denied the scientific consensus on climate change and said in a 2013 speech on the House floor that "global temperatures stopped rising 10 years ago." 

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In May, Bridenstine first announced publicly that he now believes human activity is the main cause of climate change. 

“The National Climate Assessment that includes NASA, and it includes the Department of Energy and it includes NOAA, has clearly stated it is extremely likely — is the language they use — that human activity is the dominant cause of global warming,” he said at a Senate Appropriations Committee subpanel's hearing last month.

President TrumpDonald John TrumpCorker: US must determine responsibility in Saudi journalist's death Five takeaways from testy Heller-Rosen debate in Nevada Dem senator calls for US action after 'preposterous' Saudi explanation MORE and Environmental Protection Agency Administrator Scott PruittEdward (Scott) Scott PruittEPA puts science ‘transparency’ rule on back burner Tucker Carlson says he 'can't really' dine out anymore because people keep yelling at him Overnight Energy: Trump administration doubles down on climate skepticism | Suspended EPA health official hits back | Military bases could host coal, gas exports MORE have not made similar pronouncements, however.

Trump has long denied climate change is real, once saying without evidence that it was “created by and for the Chinese in order to make U.S. manufacturing noncompetitive.”

Last December, the president tweeted during a period of cold weather that “perhaps we could use a little bit of that good old Global Warming."

In March, Pruitt told CNBC that he didn't think humans were a primary contributor to climate change, saying there's "tremendous disagreement about the degree of impact."