The proportion of Americans who say they believe in global warming has slid 20 points in two years.
Just 51% of Americans now say they believe that the release of carbon dioxide and other gases causes global warming. That's down from a high of 75% who said so in 2001 and down from the 71% who linked CO2 to global warming as recently as 2007, according to a Harris Interactive poll released this week.
The 51% who believe emissions lead to global warming is the lowest number recorded in any Harris poll since the company started asking these question 12 years ago.
What's the reason for the change? Uncertainty is growing. Former Vice President Al Gore's documentary, An Inconvenient Truth, premiered to critical and box office success in 2006. In 2007, seven in 10 Americans were sure emissions caused global warming and just 6 percent said they were unsure. Today, 21 percent say they are unsure about global warming.
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