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Gas hydrates are methane deposits found in extremely cold environments or deep in the ocean. This article offers a quick introduction. Natural gas is almost pure methane, so methane derived from gas hydrates is an easy substitution for natural gas. According to this month's Discover magazine:

Gas hydrates, which are found all around the globe, could easily make up the shortfall [in natural gas supplies]. Recent estimates indicate that just 1 percent of Earth’s hydrate deposits could yield enough natural gas to meet American needs for 170,000 years at current rates.

That sounds pretty good -- even if consumption rises by a factor of 100 to power the hydrogen economy, it would still last 1,700 years.