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External Report<br />

A World First:<br />

Japan says it has extracted gas from offshore<br />

deposits of methane hydrate - sometimes called<br />

''flammable ice'' - a breakthrough that officials<br />

say could be a step towards tapping a promising<br />

but still little-understood energy source.<br />

The gas, whose extraction from the undersea hydrate<br />

reservoir is thought to be a world first, could provide<br />

an alternative source of energy to known oil and gas<br />

reserves. That could be crucial for Japan, which is<br />

the world's biggest importer of liquefied natural gas<br />

and is engaged in a public debate about whether<br />

to resume its heavy reliance on nuclear power.<br />

Japan<br />

Extracts<br />

Methane<br />

Hydrate Gas<br />

Experts estimate the carbon found in gas hydrates<br />

worldwide totals at least twice the amount of<br />

carbon in all of the earth's other fossil fuels, making<br />

it a potential game-changer for energy-poor<br />

countries such as Japan. Researchers had already<br />

extracted gas from onshore methane hydrate<br />

reservoirs but not from beneath the seabed.<br />

Methane is a greenhouse gas, and the exact properties<br />

of undersea hydrates and how they might affect<br />

the environment are poorly understood. Japan has<br />

invested hundreds of millions of dollars to explore<br />

offshore methane hydrate reserves in the Pacific and<br />

the Sea of Japan. That task has become all the more<br />

pressing after the Fukushima nuclear crisis, which has<br />

all but halted Japan's nuclear energy program and<br />

caused a sharp increase in fossil fuel imports. Japan's<br />

rising energy bill has weighed heavily on its economy,<br />

helping to push it to a trade deficit and reducing the<br />

benefits of a weaker yen to Japanese exporters.<br />

Types of Methane Hydrate Deposits<br />

38<br />

April - June 2013

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