I disagree, I find that sex causes Global Warming.
Billions of people rubbing up on each other must raise the temperature a bit, you know friction.
Not to mention the burps and farts from humans and animals around the Globe.
The heat generated by thousands at a race track or the soccer games, darn lots of hot bodies there.
All in all I still think the number one cause is sex. All humans and animals do --[IT] and with overpopulation on earth today, the more sex we have the higher the heat goes all around the Globe.