Last summer, marked by deadly extreme heat and devastating wildfires, was the warmest in at least 2,000 years, according to new research, which analyzed weather data and tree rings to reconstruct a detailed picture of the past.

The findings offer a stark insight into the “unparalleled” warming the world is experiencing today thanks to humans burning vast amounts of planet-heating fossil fuels, according to the authors of the study published Tuesday in the Journal Nature. And it’s an alarming signal as some scientists warn 2024 is on track to be even hotter still.

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