'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 McConnellSessions: 'We should be like Canada' in how we take in immigrants NSA spying program overcomes key Senate hurdle Overnight Finance: Lawmakers see shutdown odds rising | Trump calls for looser rules for bank loans | Consumer bureau moves to revise payday lending rule | Trump warns China on trade deficit MORE (R-Ky.), and Speaker John BoehnerJohn Andrew BoehnerDems face hard choice for State of the Union response Even some conservatives seem open to return to earmarks Overnight Finance: Trump, lawmakers take key step to immigration deal | Trump urges Congress to bring back earmarks | Tax law poised to create windfall for states | Trump to attend Davos | Dimon walks back bitcoin criticism 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."