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Is Permafrost the Climate Tipping Point of No Return?

Season 3 Episode 12 | 11m 49s

Arctic air is warming, causing scientists to worry that melting arctic ice and snow could also lead to a sudden permafrost thaw and release of carbon dioxide (CO2) and methane (CH4) that forms a climate tipping point or feedback loop. And the trigger temperature may be coming much sooner than expected.

Aired: 02/13/23
Extras
The cast play a game of "What's in the vet bag?" with sentimental props from the series.
Get ready for the all-new season, coming January 17, 2027 at 9/8c.
Celebrate the legacy of Gene Wilder, the actor behind Willy Wonka and Young Frankenstein.
Explore the site of the Battle of Camden and its importance to the American Revolution.
Formerly enslaved Americans formed Britain's Colonial Marines unit and marched on Washington, D.C.
Scientists race to save the historic island on the Chesapeake Bay from rising sea levels.
The search for a sunken fort uncovers a powerful freedom story.
Tangier Island's lawns are turning into marshes. Can oyster reefs help?
Jimmy Webb, Vince Gill, Lyle Lovett and Ashley Campbell perform "Highwayman."
Sheléa performs "MacArthur Park" in this retrospective concert for Jimmy Webb.
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