A Gargantuan Oceanic Burp

Methane is a greenhouse gas that is 20 times more powerful than carbon dioxide. And thousands of gigatons of methane, equivalent to the total amount of coal in the world, lie deep within the oceans in the form of ice-like solids called methane hydrates.
The big question is whether global warming — temperatures have risen about one degree Fahrenheit over the last 30 years — will thaw some of these methane hydrates. If so, the methane might be released as a gargantuan oceanic burp. Once in the atmosphere, that methane would accelerate the greenhouse effect and warm the earth and raise sea levels even more. (NYT)