Haha, I'll take the hummer. Funny thing is, if you floor it in the Prius, you'll end up consuming more fuel than in a same sized diesel car as the Prius is soooo fat and heavy. That car only makes sense in stop and go traffic. However stop and go traffic doesn't make sense itself... :P

Oh and btw, if you're really worried about global warming you could always decat your car as O2 and the toxic CO are converted to CO2 in there. :P

Car without cat - less CO2, lol...