Poll: Likely voters who believe in man-made global warming down to 40%

A new Rasmussen Reports national telephone survey finds that 40% of Likely U.S. Voters now say global warming is caused primarily by human activity, while slightly more (44%) say long term planetary trends are to blame. Five percent (5%) blame some other reason, and 10% are not sure.

The number of voters who feel human activity is causing global warming is up seven points from early April and has reached the highest level measured since early September 2009. Meanwhile, the number of voters who blame long term planetary trends has fallen to the lowest level measured since early June of last year.

A majority (55%) of voters continue to believe President Obama feels global warming is caused by human activity. Just 21% say the president thinks long term planetary trends are to blame for climate change, while 18% more are undecided. These findings show little change since early February 2009.