Why did I leave Greenpeace after 15 years? When I began with Greenpeace, they had a strong humanitarian orientation to stop all-out nuclear war, to save civilization from destruction. By the time I left 15 years later—that’s the ‘peace’ in Greenpeace of course—by the time I left 15 years later, Greenpeace had drifted into a position along with the rest of the movement as characterizing humans as the enemies of the Earth,