Permafrost in the Arctic is thawing and melting because of warming temperatures. This is forming new lakes that are bubbling with methane. The methane is flammable, but also getting into the atmosphere where it can contribute to more warming of global temperatures.

MORE ENVIRONMENTAL SCIENCE CONTENT:
What's At The Bottom Of The Great Blue Hole?
https://www.youtube.com/watch?v=4ZcEtPFdRaQ
Why Utah Drops Fish Out Of Airplanes Into Their Mountain Lakes
https://www.youtube.com/watch?v=-8bwZPIzuug

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Why You Can Light These Lakes On Fire