Ancient trees reveal last summer hottest in 2,000 years

Last summer was the hottest in 2,000 years, according to scientists who studied the rings inside ancient trees. The temperatures in June, July, and August were nearly 4 degrees warmer than the coldest summer two millennia ago. This information was gathered from trees in the European Alps and the Russian Altai mountains. The tree rings provide detailed information about the climate each year as the trees grow. When comparing the modern temperature data, it was found that last summer was 2. 07 degrees warmer than the pre-industrial period of 1850-1900. The scientists attribute the majority of the extra warmth to human activities, but they also note that a natural climate pattern called El Niño contributed to the increased temperatures. The researchers emphasize the urgent need to reduce emissions of planet-warming gases, warning that delaying action will make it more difficult and expensive to address the issue.