Summary

The evidence that climate change threatens human health has never been stronger. Yet a new report suggests that world leaders are giving less attention to its health consequences in international political debate. The 2026 Lancet Countdown report estimates that heat was associated with 710,000 deaths worldwide in 2023, with around 71% attributable to human-caused climate change. Researchers calculated this by comparing estimated heat-related deaths at the temperatures actually experienced with those expected in a world without human-caused warming.

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