President Joe Biden took steps to protect workers from extreme heat and met with the mayors of sweltering cities Phoenix and San Antonio on Thursday as an intensifying heat wave put half of Americans under heat watches and warnings.
With this July set to become the hottest on record globally, temperatures and heat index values across the United States were forecast to soar above 100 degrees Fahrenheit (37.8 Celsius) until at least Saturday, the National Weather Service (NWS) said.
The growing frequency and intensity of severe weather is symptomatic of global, human-driven climate change that is fueling extremes, experts in the field say, with heat waves in much of the world expected to persist through August.
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