BERLIN (AP) — The head of the United Nations called Monday for scientists to serve up “cold, hard facts” to push governments into making policies that curb climate change before a key global warming threshold is passed. In a video address to delegates, U.N. Secretary-General Antonio Guterres said that the latest report by the Intergovernmental Panel on Climate Change “could not come at a more pivotal time.” “Our world is at a crossroads — and our planet is in the crosshairs,” he said. “We are nearing the point of no return; of overshooting the internationally agreed limit of 1.5 degrees...