FILE - In this Tuesday, Aug. 1, 2017, file photo, icebergs float in the Nuup Kangerlua Fjord after breaking off a glacier on Greenland's ice sheet in southwestern Greenland. In a year of cataclysm, some world leaders at September 2020's annual United Nations meeting are taking the long view, warning: If COVID-19 doesn't kill us, climate change will. With Siberia seeing its warmest temperature on record this year and enormous chunks of ice caps in Greenland and Canada sliding into the sea, countries are acutely aware there's no vaccine for global warming. (AP Photo/David Goldman, File)