Has the global-warming hysteria begun to subside?

Some interesting polling from Rasmussen:

Just one-out-of-three voters (34%) now believe global warming is caused by human activity, the lowest finding yet in Rasmussen Reports national surveying. However, a plurality (48%) of the Political Class believes humans are to blame.

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.

Granted, this is just one poll. But it's interesting indeed, considering the fact that in the last year there have been no shortage of messages for public consumption about how climate change is becoming a catastrophe and we need to take steps to stop it or slow it down -- steps such as cap-and-trade, for instance. What gives?