Sarah Palin.Photo: eskimojoe4.  Sarah Palin

Potential presidential candidate, former Alaska governor

Before before: “I’m not one … who would attribute [global warming] to being man-made,” she said in August 2008, just before being picked as John McCain’s running mate.

Before: In September 2008, after being picked, she said, “I believe that man’s activities certainly can be contributing to the issue of global warming, climate change. … John McCain and I agree that we gotta do something about it.”

After: Once McCain and Palin lost the election, she was back to form. In April 2010, she spoke derisively of “this snake-oil science stuff that is based on this global warming, Gore-gate stuff.”

Read more about Palin and climate.