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NOVA | Promotion | Arctic Sinkholes Preview

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.

S49 E1 | 0:00:30 | AIRED: 2/2/2022 |
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