Richard Branson, Virgin
Nothing divides TreeHuggers like the question of whether corporations can play a role in a transition to a sustainable future. And nobody personifies that better than Virgin founder Richard Branson. It's true that his eco-resort for the mega-rich and (comparatively) energy efficient plans for space tourism are certainly gray areas that will leave cynics unconvinced. But given that he has also launched a carbon war room; rallied business around the threat of peak oil; offered serious cash rewards for successful removal of atmospheric carbon and successfully instigated energy efficiency ratings for the shipping industry, it seems to me that he has done more than most corporate fat cats to push the conversation forward.