2023 Northern Hemisphere summer hottest in 2,000 years

A study in Nature revealed that the summer of 2023 was the hottest in the Northern Hemisphere in over 2,000 years. Using tree rings, researchers found it was 2.1°F warmer than the previous record from the year 246. The study's precision in estimating summer temperatures sets it apart from other methods. Scientists warn of more extreme temperature increases in the future due to climate change.