Its a sham. For the small amount of Hummers on the planet, it's hardly a drop in the bucket compared to larger vehicles like trucks, flatbed trucks & commercial trucks. Granted some of them use diesel... but if you wanted to get on that, just think of a lot of the commercial ships that all run on diesel.
I also like to remind the Prius owners of the spot up in Sudbury where all their nickel for their batteries comes from.
http://www.sprol.com/2005/06/the-inc...dbury-ontario/