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Some scientists suspect that permafrost acts as a cap that protects hydrates from melting, particularly in the shallow Arctic seafloor, where the hydrates are found only a few tens of feet deep. The more that sea or lake waters thaw the permafrost below, the more likely this cap is to blow suddenly, releasing jets of methane up through the water and into the atmosphere.

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A webspace devoted to the current state of our arctic and antarctic sea ice including an archive of daily polar sea ice cap concentrations (1979 - present)

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Greenland's ice cap, which covers more than 80 percent of the island, is melting faster than expected because of global warming, a Danish researcher said on Monday.
The 1.8-million-square-kilometre (695,000-square-mile) ice cap, which accounts for 10 percent of the planet's fresh water, is losing about 257 cubic kilometres (62 cubic miles) of ice per year.

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