Climate Change, Human-Caused or Natural?

When I decided to use the above title, I was pretty sure a majority of the U.S. public would select the first option (human-caused). But after selecting it, did a search for a recent poll from a respected pollster that asked this question.

I found a Pew Research poll that asked, “How much do Americans think humans contribute to climate change?”  The answers to this question were:

• A great deal       45%
• Some    29%
• Not too much or not at all           25%

So, 74% believe that humans contribute to climate change a great deal or some.