What are your environmentally-unfriendly "sins"?

Well, both of my vehicles are V8 powered, (supercharged Mustang, and a full sized Bronco) . I leave my desktop computer running 24/7, I like to keep my house at a balmy 72 degrees during the summer. My home theater is fairly power hungry. But on the plus side most the bulbs in my house are compact florescent and I just bought a new energy star compliant fridge and dishwasher. :)