Read other letters about this article
If you're commuting to work via bicycle and leaving the SUV in the driveway, it's entirely possible that your carbon footprint is less than many Prius owners.
I don't judge strangers based simply on the cars they drive- although it's plain that when I pull into a metro area parking lot jammed full of SUVs and outsized trucks, that a whole lot of folks must have gone for the okey-doke.
(I'm the guy in the 1990 Toyota Camry.)
Really, if you just want a big vehicle for vacations, weekenders, or long trips, the rental option is always there. Do the math.