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Expand chart
Adapted from Rick Thoman's analysis using data from the National Snow & Ice Data Center; Chart: Chris Canipe/Axios

Earlier this year, we saw the unprecedented disappearance of sea ice from the Bering Sea during a time of year when it should be gaining ice. This trend toward plummeting sea ice in the Alaskan and Canadian Arctic continues, this time centered in the Chukchi and Beaufort seas.

Why it matters: Sea ice loss is disrupting the balance of heat in the Northern Hemisphere, and it is reverberating throughout ecosystems, causing everything from plankton blooms near the Arctic Ocean surface to mass haul-outs of walruses in Russia and Alaska. It may also be disrupting weather patterns across the Northern Hemisphere.

The big picture: Across the entire Arctic, sea ice extent is at a record low for this point in the year, and depending on weather conditions during the summer, it's possible that 2019 could set a new record low ice extent.

  • The all-time record low sea ice extent was set in 2012, although subsequent years have nearly beaten that mark.
  • So far, weather conditions have favored an early start to the Greenland ice melt season, too, and ice melt there, unlike disappearing sea ice, contributes to global sea level rise.
  • The portion of Greenland experiencing melting ice hit a record high for the date on June 13, with temperatures rising to near freezing at Summit Station, in the center of the ice sheet.
  • The Arctic is warming at more than twice the rate of the rest of the world.

What they're saying:

  • "At the moment, you can essentially sail uninterrupted from the North Pacific to the Canadian Arctic," says Zack Labe, a climate scientist and Ph.D. candidate at the University of California, Irvine.
  • "The Arctic is a regulator of Northern Hemisphere climate, and while the ice that is melting now isn't going to affect whether you get a thunderstorm tomorrow, in the long term, these are going to have profound effects on your weather and climate down the road that you will have to take action on, like it or not," says Rick Thoman of the University of Alaska at Fairbanks.

Go deeper: New U.S. Arctic strategy omits climate change, takes aim at China, Russia

Go deeper

Bryan Walsh, author of Future
4 mins ago - Politics & Policy

U.S. students fell 4 to 5 months behind during pandemic

An empty classroom in Pinole, Calif. Photo: David Paul Morris/Bloomberg via Getty Images

Elementary school students in the U.S. ended the school year four to five months behind their expected level of academic achievement, according to a new report.

Why it matters: Months of school closures and often inferior remote education eroded what schoolchildren would have learned since the pandemic began, and caused some to go backwards.

Updated 7 mins ago - Sports

Olympics dashboard

🚨: Simone Biles pulls out of gymnastics team finals citing her mental health

🏄‍♀️: American Carissa Moore wins first-ever women's Olympic gold in surfing

🎾: Naomi Osaka eliminated from Olympic tennis tournament

⚽️: USA women's soccer ties Australia, propelling them to the quarterfinals

🏉: USA men's rugby knocked out after blowing 21-0 lead to Great Britain

🏊‍♀️: Teen swimmer Lydia Jacoby wins first U.S. women's Tokyo Games gold

👟: World Athletics president supports reviewing marijuana rules in doping

Go deeper: Full Axios coverage - Medal tracker

CDC: Vaccinated people in COVID hotspots should resume wearing masks

CDC director Rochelle Walensky and top infectious disease expert Anthony Fauci at a Senate HELP committee hearing. Photo: J. Scott Applewhite-Pool/Getty Images

The Centers for Disease Control and Prevention issued updated guidance on Tuesday recommending that vaccinated people wear masks in indoor, public settings if they are in parts of the U.S. with substantial to high transmission, among other circumstances.

Why it matters: The guidance, a reversal from recommendations made two months ago, comes as the Delta variant continues to drive up case rates across the country. Millions of people in the U.S. — either by choice or who are ineligible — remain unvaccinated and at risk of serious infection.