Reuters: The world’s sea levels could rise twice as high this century as U.N. climate scientists have predicted, according to researchers who looked at what happened more than 100,000 years ago, the last time Earth got this hot. Experts working on the U.N.’s Intergovernmental Panel on Climate Change have suggested a maximum 21st century sea level rise — a key effect of global climate change — of about 32 inches. But researchers said in a study appearing on Sunday in the journal Nature …