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.
- Giant craters were spotted in Russia.
- [Narrator] The frozen world of permafrost is melting.
- The ground exploded.
- [Narrator] Releasing planet-warming gasses.
- [Woman] There's a huge amount of methane
and natural gas trapped in the permafrost.
- [Narrator] What will it mean for our planet?
- It's a scary wild card in the climate change story.
- It could really affect everyone on earth.
- [Narrator] "Arctic Sinkholes," on Nova.