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Climate change effects. Arctic permafrost has been diminishing for many centuries. The consequence is thawing soil, which may be weaker, and release of methane, which contributes to an increased rate of global warming as part of a feedback loop caused by microbial decomposition.

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Permafrost is ground that remains frozen after a long period of time, and is in places like the Arctic. If it melts, then the Arctic is a step closer to melting because the ground will then be softer and not frozen over. As the Arctic melts, glaciers do, too. As glaciers melt the sea levels will rise due to more water, and that is a main problem due to climate change.