A UN climate summit in Madrid risked collapsing Saturday after all-night negotiations between countries left them more divided than ever over on how to fight global warming and pay for its ravages. Diplomats from rich nations, emerging giants and the world’s poorest countries — each for their own reasons — found fault in a draft agreement put forward by host Chile in a botched attempt to strike common ground. Faced with five-alarm warnings from science, deadly extreme weather made worse by climate change, and weekly strikes by millions of young people, negotiations in Madrid were under pressure to send a clear signal that governments are willing to double down in tackling the crisis.
