NOVA

Arctic Sinkholes

Season 49 Episode 1 | 53m 28s | Video has closed captioning.

Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas.

Aired: 02/02/22

Expires: 02/01/25

Rating: TV-PG

Problems Playing Video? | Closed Captioning

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