Biggest Heat Dome In History Trapped 270 Million Americans

By Douglas McIntyre  •  July 29, 2025

Douglas McIntyre, Editor-in-Chief at Climate Crisis 24/7, explains that the largest heat dome by size occurred recently in the U.S., covering over 30 states and affecting 270 million people. While other heat domes have lasted longer or been more deadly, this one stands out in scope. McIntyre warns that, due to climate change, more extreme heat domes are increasingly likely.

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