This report has been compiled by the World Meteorological Organization under the auspices of the Science Advisory Group of the UN Climate Action Summit 2019, to bring together the latest climate science related updates from a group of key global partner organizations – The World Meteorological Organization (WMO), UN Environment (UNEP), Intergovernmental Panel on Climate Change (IPCC), Global Carbon Project, Future Earth, Earth League and the Global Framework for Climate Services (GFCS). The content of each chapter of this report is attributable to published information from the respective organizations. Overall content compilation of this material has been carried out by the World Meteorological Organization.