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People walking through a fountain at dusk in Hobroken, New Jersey, on June 29. Photo: Gary Hershorn/Getty Images

Nights on average are heating up faster than days in most parts of the United States — a trend caused by climate change, according to the 2018 National Climate Assessment Report, newly cited by the New York Times.

Why it matters: Last month was the hottest June on record for the U.S., and more than 1,500 areas of the country logged new record-high overnight temperatures toward the end of the month.

Abnormally high nighttime temperatures can increase the risk of heat-related hospitalizations and deaths because prolonged stretches of hot weather prevent people from cooling off from the day’s heat.

  • They can also worsen wildfire conditions because fires typically die down overnight when temperatures dip, the air cools and humidity increases.

What they're saying: “[I]t’s really important that people have an opportunity to bring their core body temperature down,” Kristie Ebi, an environmental health scientist at the University of Washington, told the Times.

  • “When it’s really hot at night, you don’t have that relief and it puts more physiological strain on your body," Ebi added.

How it works: Meteorologists and other scientists believe nights are heating up as temperatures rise throughout the day and the air is able to hold more moisture.

  • They theorize that the increased moisture in the air traps heat close to the ground’s surface, producing warmth that can persist throughout the night.

Go deeper: Pacific Northwest heat wave "virtually impossible" without climate change

Go deeper

Oct 12, 2021 - Science

Weather and climate disasters have cost the U.S. over $100 billion in 2021

Piles of debris is all that's left of a restaurant after heavy rain from remnants of Hurricane Ida came through in Manville, New Jersey, on Sept. 7. Photo: Tayfun Coskun/Anadolu Agency via Getty Images

Weather and climate disasters in 2021 have killed 538 people in the U.S. and cost over $100 billion, according to a report from the National Oceanic and Atmospheric Administration.

Why it matters: The first nine months of 2021 saw the largest number of billion-dollar disasters in a calendar year so far, with 2021 on pace for second behind 2020, per the report.

The hard math behind America's labor shortage

Data: Bureau of Labor Statistics, Congressional Budget Office; Chart: Axios Visuals

Yes, the pandemic has created unusual temporary labor market dynamics. But in the bigger picture, the 2010s were a golden age for companies seeking cheap labor. The 2020s are not.

The big picture: In the 2010s, the massive millennial generation was entering the workforce, the massive baby bo0m generation was still hard at work, and there was a multi-year hangover from the deep recession caused by the global financial crisis.

Advocates fret Roe v. Wade's 49th anniversary could be its last

Photo: Leigh Vogel/Getty Images for Women's March Inc

As Saturday marks the 49th anniversary of Roe v. Wade, the Supreme Court's landmark decision that legalized abortion access in the U.S., advocates warn the ruling is "more at risk now than ever."

The big picture: The Supreme Court in December heard a challenge to a Mississippi 15-week abortion ban that could throw Roe's survival into question, or at least narrow its scope.