Only 19 percent of U.S. meteorologists saw human influences as the sole driver of climate change in a 2011 survey. And some, like the Weather Channel's founder John Coleman are vocal in their opposition.

"It is the greatest scam in history," wrote Coleman, one of the first meteorologists to publicly express doubts about climate change, on his blog in 2007. "I am amazed, appalled and highly offended by it. Global Warming; it is a SCAM."