Which geomorphic outcome accelerates when Arctic permafrost thaws containing large amounts of trapped organic matter?

💡 Explanation

When organic-rich permafrost thaws, microbial decomposition increases because formerly frozen organic matter becomes available as a substrate, releasing carbon dioxide and methane, which accelerates soil subsidence and thermokarst formation. Therefore thermokarst expansion results, rather than carbon sequestration, methane reduction or albedo increases which require preservation or buildup of ice & vegetation cover.

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