But the idea of the green challenge I've undertaken with Nicole is not just to one-up each other (OK, that is a big part of it) but also to mutually and permanently improve our behavior by becoming aware of the activities we engage in that cause environmental damage. Because, you know, knowing is half the battle. So today I calculated my "carbon quotient," the amount of carbon dioxide I'm personally responsible for emitting into the atmosphere. Unfortunately, the numbers were staggering. I used three different online calculators because each asked slightly different questions, and I got similarly lousy results from all of them. Apparently, my jetsetting lifestyle equals about 17 tons of carbon per year, or approximately 2,800 pounds of carbon a month. According to climatecrisis.net, 1,000 to 2,000 pounds per month is normal. More damning still, notes fightglobalwarming.com, I could "release about the same amount of carbon pollution by cutting and burning all the trees in a section of the Amazon rainforest the size of 2.7 football fields."