There was a rumor that was circulating a few years ago. I recall it being on the internet, but not in the mainstream media.
It went, that because a Toyota Prius used lithium batteries, and that mining lithium caused so much environmental damage, the Hummer was actually better for the environment over the long term. Really?
A number of writers have since clearly disproved this. See their valid analysis here:
However, I did my own simple analysis. It was not difficult at all. The hardest part is finding the correct numbers.
Prius - Weight Of The Battery: