Global warming deniers may have to take note: climate change is already big business for entrepreneurs and investors all over the world. Shell Oil has been strategizing about it for decades. Wall Street is in on the action. Coca Cola and Nike recognize it's shaping their bottom lines. We hear how money's being made -- from the Arctic to Africa and the Tropics, and how the US government will have to play catch-up. What are the potential costs of looking the other way, and the differing consequences for the haves and the have-nots?