Over at the website for The Inconvenient Truth they have a Carbon Calculator. It's a helpful way for figuring out how much carbon dioxide each of us produces every year. I calculated my personal emission and was rather surprise by the total: 1.65 tons ... TONS!?! Talk about bad news.
The good news is that this is well below the typical level of personal emissions. The biggest factor is that I'm carfree. Also, I haven't been flying as much as I used to. If you play around with the numbers you'll see how drastically your CO2 emission rises.