many pregnancies are shorter as climate change causes more 90-degree days

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Alan Barreca Featured in NBC News: Very Hot Weather Prompts Early Births, Study Says

“We saw a spike in births on hot days,” said study author Alan Barreca, an associate professor in environmental economics at the University of California, Los Angeles. For example, Barreca noticed a 5 percent increase in birth rates on days that were over 90 degrees Fahrenheit.