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re: There is also always Methane Hydrates

Devin says: "Anyone care to speak on that? Does anyone know the numbers there?"

"Gas hydrates occur abundantly in nature, both in Arctic regions and in marine sediments. Gas hydrate is a crystalline solid consisting of gas molecules, usually methane, each surrounded by a cage of water molecules. It looks very much like water ice. Methane hydrate is stable in ocean floor sediments at water depths greater than 300 meters, and where it occurs, it is known to cement loose sediments in a surface layer several hundred meters thick.

The worldwide amounts of carbon bound in gas hydrates is conservatively estimated to total twice the amount of carbon to be found in all known fossil fuels on Earth."
http://marine.usgs.gov/fact-sheets/gas-hydrates/title.html

There is a lot more in this article such as:
"Recent mapping conducted by the USGS off North Carolina and South Carolina shows large accumulations of methane hydrates.

A pair of relatively small areas, each about the size of the State of Rhode Island, shows intense concentrations of gas hydrates. USGS scientists estimate that these areas contain more than 1,300 trillion cubic feet of methane gas, an amount representing more than 70 times the 1989 gas consumption of the United States."

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