Saguaro cactus under extreme stress during Arizona’s brutal summer heat wave on Aug. 2, 2023. Saguaro are the largest cactus in the nation and can live 150-200 years and reach heights of over 50 feet. Mario Tama / Getty Images
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After studying tree rings from the past 2,000 years, researchers have found that the Northern Hemisphere experienced its hottest summer in 2023 in the past two millennia.
The researchers used both observed and modeled surface air temperatures for the period…
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