United in science 2022: a multi-organization high-level compilation of the most recent science related to climate change, impacts and responses

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. According to the WMO Global Atmosphere Watch, atmospheric greenhouse gas (GHG) concentrations continue to rise, despite emissions reductions in 2020 resulting from the COVID-19 pandemic lockdowns. The Global Carbon Project also notes that, in 2021, global fossil CO2 emissions returned to 2019 pre-pandemic levels after a large, but temporary, absolute drop in emissions due to widespread lockdowns. These conditions are leading to increasing global surface temperature and other climatic changes, as highlighted by the WMO State of the Global Climate 2021 report, which found the most recent seven years, 2015 to 2021, to be the warmest on record.