Despite the EPA's obviously biased opinion otherwise, Greenpeace has declared Apple to be Teh Evil for Mother Gaia—not because Macs are dirtier than other computers, but (I guess) because they're fun and people like them. At least that reasoning would be consistent for them.
It would also explain why they think this is a worthwhile use of Earth's precious electricity:
Guys, Steve is already a tree-hugging hippie. You want to drive him to the other side in anger?