Here’s an excerpt from a great article on global warming:

In 2005, Annan offered to take Lindzen, the MIT meteorologist, up on his bet that global temperatures in 20 years will be cooler than they are now. However, no wager was ever settled on because Lindzen wanted odds of 50-to-1 in his favor. This meant that for a $10,000 bet, Annan would have to pay Lindzen the entire sum if temperatures dropped, but receive only $200 if they rose.

“Richard Lindzen’s words say that there is about a 50 percent chance of [global] cooling,” Annan wrote about the bet. “His wallet thinks it is a 2 percent shot. Which do you believe?”

Talk is indeed cheap.