Try telling him that….
Check it out:

President Obama’s statements on global warming are “dead wrong,” said Nobel laureate Ivar Giaever, who rejected the president’s claims that man-made global warming is causing climate change.

“I think Obama is a clever person, but he gets bad advice. Global warming is all wet,” Giaever said in a speech entitled Global Warming Revisited he gave on July 1 to scientists from 90 countries attending the 65th annual Nobel Laureate Meeting in Lindau, Germany.