I listened to NPR on my way to work yesterday, there are skeptics ... 

"In one poll last year, only about 50 percent of people agreed humans were contributing to global warming. The other half either disagreed, weren't sure or didn't believe the Earth was warming in the first place."

In this case, it was a 16 year-old scientist-minded girl who challenged  Al Gore's documentary An Inconvenient Truth.

She says, "the Earth is warming. But no, humans aren't causing it. She says it's part of the natural climate cycle."

Being a skeptic, doesn't mean she does not think Green. Here's the last two paragraphs;

Kristen is getting out of the climate-change business. She thinks she would like to become an architect — maybe even build energy-efficient "green" buildings.

She does not see herself as an environmentalist, though. She says that makes her think of hippies.