Guardian: The more we know, the grimmer it gets. Presentations by climate scientists at this week’s conference in Copenhagen show that we might have underplayed the impacts of global warming in three important respects: * Partly because the estimates by the Intergovernmental Panel on Climate Change (IPCC) took no account of meltwater from Greenland’s glaciers, the rise in sea levels this century could be twice or three times as great as it forecast, with grave implications for coastal …