In a strategic retreat in the fight against climate change, the U.N. acknowledges that Earth has lost its chance to prevent some of the worst of global warming’s harms. So now the world must figure out how to get temperatures below the danger zone and back to safety, officials say. ↧ Global warming will exceed limit, U.N. says in a report that maps p... “If we act now we can limit overshoot,” the report said. “Not a safe world, but safer than remaining above” 1.5 degrees for the long term.