Arctic methane release due to melting ice is likely to happen again

Source: Science Daily

Beneath the cold, dark depths of the Arctic ocean sit vast reserves of methane. These stores rest in a delicate balance, stable as a solid called methane hydrates, at very specific pressures and temperatures. If that balance gets tipped, the methane can get released into the water above and eventually make its way to the atmosphere.

https://www.sciencedaily.com/releases/2021/03/210322135221.htm