RT Report T1 Bridging the Emissions Gap: The Role of Non-state and Subnational Actors - Pre-release version / chapter A1 United Nations Environment Programme, A2 Hsu, Angel A2 Widerberg, Oscar A2 Weinfurter, Amy A2 Chan, Sander A2 Roelfsema, Mark A2 Lütkehermöller, Katharina A2 Bakhtiari, Fatemeh K1 non-state actor K1 climate change K1 city K1 greenhouse gas emission PB United Nations Environment Programme SN Not Available YR 2018 FD 2018 LK https://wedocs.unep.org/handle/20.500.11822/26093 UL https://wedocs.unep.org/handle/20.500.11822/26093 NO This publication is part of a collaborative series of reports by more than 30 organisations released alongside the 2018 Global Climate Action Summit. The series showcases climate action by states, regions, cities, businesses and investors and assesses opportunities for greater impact. This pre-release report focuses specifically on the role of non-state and subnational actors in enhancing global climate ambition and bridging the emissions gap. It examines mitigation actions by cities, regions, businesses and other actors, assessing their potential contribution to reducing greenhouse gas emissions and reviewing existing initiatives, evidence and research on their scale and scope. DS UN Environment Document Repository RD Sep 22, 2026