Last year, I was talking to one fellow about recycling. The conversation turned to global warming.
"What do you think we should do about it?" he asked.
"I do not think the globe is warming."
"Oh, you don't believe in global warming?"
"Believe!? Is it a religion? What is there to believe? It is either happening or not. If one looks at figures, the earth has been cooling for the past ten years."
He looked at me like I'd grown horns. He wanted to discuss the merits and demerits of various taxes to combat global warming but I didn't even yield on its existence.
On the same topic, here's Vox Day:
Never place any trust in an expert who can't explain himself to your satisfaction. Especially when he's asking you for money.