Rasmussen: Only 30% of voters think global warming is a very serious problem

About equal numbers attribute global warming to man-made activity and planetary trends.
Rasmussen:

Belief that global warming is a serious problem is at its highest level in two-and-half-years, but fewer voters than ever give President Obama positive marks on his handling of this issue.

A new Rasmussen Reports national telephone survey of Likely Voters finds that 64% say global warming is at least a somewhat serious problem, including 30% who say it’s Very Serious.  One-in-three voters (33%) believe climate change is not a serious problem, with 14% who feel it’s Not At All Serious.  (To see survey question wording, click here.)