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Gas Hydrates

There is another vast store of methane on the planet. It has been the source of doomsday scenarios and much speculation. But the facts do not live up to the dramatic scenarios.
In the cold depths of the ocean, natural gas and water can meld into ice-like mixtures known as methane clathrates or gas hydrates. These frozen gas deposits occur all over the world, mostly along the edges of continents, though the deposits can only occur under certain pressure and temperature conditions. The total volume of gas hydrates is thought to be enormous. Most estimates suggest more energy is stored underwater in gas hydrates than all other fossil fuel sources combined.
The oceans sequester carbon. Subduction helps bury this carbon beneath the earths crust.

and it ends up in places like this.

The issue is land based tundra emissions as permafrost melts.

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