Delegates of the UN climate talks on Saturday worked to find common ground on a host of proposals, including a push by many nations to explicitly cite the cause of global warming: the burning of oil, gas and coal for energy. The annual talks this year are being held in Belem, a Brazilian city on the edge of the Amazon rainforest. They were scheduled to wrap up Friday, but negotiators blew past that deadline, and it wasn’t clear when they might finish. Juan Carlos Monterrey Gomez, a top negotiator for Panama, said Friday that the decades-long United Nations process risks...