WWF's semi-guerilla art
My initial reaction to this to think it's a nice little bit of semi-guerrilla art... but then it occurred to me that it's a bit off. The rain forest isn't being chopped down for paper, it's being chopped down for grazing & crop land. Does misleading people about the problem really help?
More interesting (and perhaps more on-target) is their "ocean-levels rising" billboard: