In a strategic retreat, the United Nations concedes that Earth has lost its chance to prevent some of the worst impacts of global warming World must figure out how to get temperatures below the danger zone and back to safety, officials say Key points and original sources are listed below.

• In a strategic retreat, the United Nations concedes that Earth has lost its chance to prevent some of the worst impacts of global warmingS1

• World must figure out how to get temperatures below the danger zone and back to safety, officials sayS2