Last Year Tied 2016 as the Hottest Year in Recorded History

摘要

The decade ending in 2020 was the hottest in recorded history, with temperatures higher than anyother period in at least two millennia and possibly much longer. The main culprit behind theextreme warming, atmospheric carbon dioxide, has reached a level not seen in at least 3 millionyears. The last seven years are now the warmest since measurement began in the 19th century.