Long time ago, by not saying 8 years ago, I asked a friend of mine who live in the U.S. about how the U.S. citizens see the climate change and the global warm. His answer, however, was surprising for me: "They don't believe in those", he said. "For them, those themes are just a lie, a myth, a children's story". Years later, I've read in Yahoo Answers similar words, adding the (in)famous tag "conspiracy theory".
It made me wonder this: If they don't believe in that, then how the hell there are scientists studying the causes of these global issues?