The greatest task of the Obama administration—and the next 10 presidents—is to avoid catastrophic global warming. The latest science warns that the unstable West Antarctic ice sheet has been warming significantly since the 1950s, the rate of Greenland summer ice loss tripled last year, and the planet as a whole lost 2 trillion tons of ice in the last five years. The best mid-range estimate for sea level rise by the year 2100 is 5 feet, much higher than U.N. scientists projected just two years ago.
Read more here.