Four billion people endured extra month of extreme heat due to climate change, scientists say

San Mateo Daily Journal · last updated May 30, 2025 – 10:22 PM

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Four billion people, about half the world’s population, experienced at least one extra month of extreme heat due to human-caused climate change from May 2024 to May 2025, scientists say. The extreme heat caused illness, death, crop losses, and strained energy and healthcare systems, according to the analysis from World Weather Attribution, Climate Central and the Red Cross.

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