The hottest year that has been recorded in 2,000 years was found to be 2023, as per researchers.
Moreover, 2023 has also been found to be the hottest summer in the Northern Hemisphere which is almost four degrees warmer than the coldest summer during the same time.
Scientists from the University of Cambridge and Johannes Gutenberg University Mainz have shown how drastic the summer of 2023 was by using past climate information from annually resolved tree rings over two millennia.
Exceeding the extremes of natural climate variability by half a degree Celsius, 2023 was still the hottest summer since the height of the Roman Empire even after allowing for natural climate variations over hundreds of years.
"When you look at the long sweep of history, you can see just how dramatic recent global warming is," said co-author Professor Ulf Büntgen, from Cambridge’s Department of Geography.
"2023 was an exceptionally hot year, and this trend will continue unless we reduce greenhouse gas emissions dramatically."
In the Northern Hemisphere, the 2015 Paris Agreement to limit warming to 1.5C above pre-industrial levels has already been breached, as per the results reported in the journal Nature.