Fun poster from Keep Calm (www.keep-calm.com)

The National Geographic channel is going to have a special show on Sunday night called Human Footprint. Earth Day is April 22.
We've all had a rollicking conversation about greening our lifestyles.

But have you calculated your carbon footprint? There are a host of websites that will help you do it, but the one I like is right here. It's simple, quick, and tells you how you compare to the average American. They also offer a link to buy some "carbon offsets," but those have always seemed like a cop-out to me.

What's your footprint? How do you compare to others?