2021 Rated One of the Hottest Years Ever as CO2 Levels Hit Record High

2021 was the fifth-hottest year on record and close to 1.2 degrees C (2.1 degrees F) warmer than the preindustrial average, according to an analysis from the European Union's Copernicus Climate Change Service. The last seven years were the hottest ever “by a clear margin,” the analysis found, thank...