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Historic Heatwave Hits Southwest: Climate Change's Deadly Impact

3/21/2026

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Summary

Story summary

The US Southwest is experiencing a severe heatwave, with Arizona reaching 43.3°C (110°F), the hottest March day in US history.
Climate scientists from World Weather Attribution say human-caused climate change is making such extreme weather more frequent.
Officials note the rising frequency and cost of billion-dollar weather disasters, challenging adaptation.
Scientists say the heatwave would be virtually impossible without climate change, linking the event to warming.

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Story summary

The US Southwest is experiencing a severe heatwave, with Arizona reaching 43.3°C (110°F), the hottest March day in US history.
Climate scientists from World Weather Attribution say human-caused climate change is making such extreme weather more frequent.
Officials note the rising frequency and cost of billion-dollar weather disasters, challenging adaptation.
Scientists say the heatwave would be virtually impossible without climate change, linking the event to warming.