'I'm not a scientist, either,' president says

President Obama flipped the script on Republicans on the science behind climate change, admitting he's not a scientist, but he knows "a lot of really good" ones. 

"I’ve heard some folks try to dodge the evidence by saying they’re not scientists; that we don’t have enough information to act," Obama said Tuesday night. "Well, I’m not a scientist, either.  But you know what — I know a lot of really good scientists at NASA, and NOAA, and at our major universities." 

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The president said he trusts "the best scientists in the world" that are saying "our activities are changing the climate."

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellKey GOP senators appear cool to Kavanaugh accuser's demand Trump hints at new executive action on immigration, wants filibuster-proof Senate majority The Hill's Morning Report — Sponsored by United Against Nuclear Iran — The Hill interviews President Trump MORE (R-Ky.), and Speaker John BoehnerJohn Andrew BoehnerNancy Pelosi: Will she remain the ‘Face of the Franchise’? Jordan hits campaign trail amid bid for Speaker GOP senator says he 'regularly' considers leaving Republican Party MORE (R-Ohio) have often used the line when arguing against the administration's climate agenda. 

He stressed that if the U.S. doesn't "act forcefully," the country will see more rising oceans, longer heat waves, droughts, floods, and disruptions that can "trigger greater migration, conflict, and hunger around the globe."

"The Pentagon says that climate change poses immediate risks to our national security," Obama said. "We should act like it."