Basically the same as 25 years ago:

Just over one-third of Americans worry "a great deal" about climate change, down one percent from 1989. That despite nearly every other climate change metric—temperatures, sea levels, carbon dioxide concentration, and major storms—continuing to steadily increase.

I'm not sure what would account for this, but concern about climate change did spike among Americans in April of 2000 and March of 2007. Then it returned to 25-years-ago levels. Theories?