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Ancient trees show how hot summers have gotten
Last summer was the hottest in 2,000 years in the Northern Hemisphere.
“Personally, I’m not surprised, but I’m worried,” Jan Esper, lead author of the study and a professor of climatology at Johannes Gutenberg University, said in a briefing with reporters. Two degrees Celsius of global warming would be enough to shift 13 percent of Earth’s ecosystems to a new biome, according to the Intergovernmental Panel on Climate Change. We saw a deadly taste of that already last year, with record-breaking heatwaves across Europe, North America, and China that would have been “ extremely rare or even impossible without human-caused warming,” according to an international collaboration of researchers called World Weather Attribution.
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