United in Science provides an overview of the most recent science related to climate change, impacts and responses from the World Meteorological Organization (WMO) and partner organizations. At a time when urgent action to address climate change is needed, the report provides unified scientific information to inform decision-makers and highlights some of the physical and socioeconomic impacts of the current and projected climate. This report has been compiled by the World Meteorological Organization (WMO) under the direction of the United Nations Secretary-General to bring together the latest climate science-related updates from key global partner organizations – WMO, Global Carbon Project (GCP), UN Environment Programme (UNEP), Met Office (United Kingdom), Urban Climate Change Research Network (UCCRN), UN Office for Disaster Risk Reduction (UNDRR), World Climate Research Programme (WCRP, jointly sponsored by WMO, IOC-UNESCO and the International Science Council (ISC)) and the Intergovernmental Panel on Climate Change (IPCC). The content of each chapter is attributable to each respective organization.