Grist: When James Hansen speaks, climate hawks listen. Hansen was legendary during his long career as NASAs chief climatologist for being ahead of the curve on seeing the threat of catastrophic climate change. Now he teaches at Columbia University, and he has more bad news to deliver. According to a study conducted by Hansen and 16 coauthors, being published this week in the European Geophysical Unions open-access journal Atmospheric Chemistry and Physics, the effects of even moderate warming on sea-level...