News WMO warns of 1.5 degree C. limit by 2024 A key threshold of the 2015 Paris Agreement against the worst effects of global warming could be reached within five years, WMO warned. By Arete News - July 9, 2020 The Arctic National Wildlife Refuge in northeastern Alaska (AN/Hillebrand/USFWS) You need to login to view this content. Please Login. Not a Member? Join Us