This is interesting. My old Public Allies placement, The Center for Neigborhood Technology and Airhead provide a handy emissions calculator that calculates how much air pollution you're responsible for in a given month. Cathy and I, for example, were responsible for 787 lbs of air pollution- far lower then the national average due to the fact that we rarely drive our car and bike just about every day. Though, sometimes, like when I'm making that ever so slight ascent for those two miles to the UC Berkeley recreation center, my reservations concerning the internal combustion engine all but vanish.