Climate change could destabilize ` ` weak '' states , intelligence chair says . Global warming could spark mass migrations , classified report finds . U.S. food production could decline with climate change , report finds . But it says the coasts could be hit by larger storm surges .
Climate change could destabilize `` weak '' states , intelligence chair says . Global warming could spark mass migrations , classified report finds . U.S. food production could increase with climate change , report suggests . But it says U.S. coasts could be threatened by larger storm surges .