News U.N. chief taps Bloomberg for key climate role Michael Bloomberg was reappointed to the role of U.N. Secretary-General António Guterres’ special envoy on climate ambition and solutions. By Arete News - February 5, 2021 Michael Bloomberg at the 2018 Global Climate Action Summit (AN/Nikki Ritcher) You need to login to view this content. Please Login. Not a Member? Join Us