Calculate your carbon footprint

The online calculator at www.ecofoot.org is really fun; very suited for pre-teens or teens. You get to create an avatar and walk around consuming CO2 in a video-game type of animation. At the end it is revealed how many planets it would take to sustain your lifestyle if everyone on earth were living your way. My score was just under 4 planets. Yikes.

The measurements are not super precise, however. So take it as entertainment, not science.