EU scientists say 2021 was world#39;s fifth-hottest year on record The EU#39;s Copernicus Climate Change Service (C3S) said in a report on Monday that the last seven years were the world#39;s warmest “by a clear margin” in records dating back to 1850 and the average global temperature in 2021 was 1.1-1.2C above 1850-1900 levels.