A new Rasmussen survey found that just one-out-of-three US voters (34%) believe global warming is caused by human activity, the lowest finding yet in Rasmussen Reports national surveying. Forty-eight percent (48%) of all likely voters attribute climate change to long-term planetary trends, while seven percent (7%) blame some other reason. Eleven percent (11%) aren’t sure. These numbers reflect a reversal from a year ago when 47% blamed human activity while 34% said long-term planetary trends.

A plurality (48%) of the Political Class believes humans are to blame. Most Democrats (51%) still say humans are to blame for global warming, but 66% of Republicans and 47% of adults not affiliated with either party disagree.

Sixty-two percent (62%) of all Americans believe global warming is at least a somewhat serious problem, with 33% who say it’s Very Serious. Thirty-five percent (35%) say it’s a not a serious problem. The overall numbers have remained largely the same for several months, but the number who say Very Serious has gone down.

Forty-eight percent (48%) of Democrats say global warming is a Very Serious problem, compared to 19% of Republicans and 25% of unaffiliateds.

Other results:

*

49% of Americans think the President Obama believes climate change is caused primarily by human activity. This is the first time that belief has fallen below 50% since the president took office. Just 19% say Obama attributes global warming to long-term planetary trends.
*

48% rate the president good or excellent on energy issues. Thirty-two percent (32%) give him poor grades in this area. Sixty-three percent (63%) of adults now say finding new sources of energy is more important that reducing the amount of energy Americans currently consume. However, 29% say energy conservation is the priority
*

A growing number of Americans (58%) say the United States needs to build more nuclear plants. This is up five points from last month and the highest finding so far this year. Twenty-five percent (25%) oppose the building of nuclear plants.
*

While the economy remains the top issue for most Americans, 40% believe there is a conflict between economic growth and environmental protection. Thirty-one percent 31% see no such conflict, while 29% are not sure.

Results are from a national survey of 1,000 likely voters, conducted 15-16 April 2009.