
The process also could degrade evidence of early human activity in the Arctic, preserved in organic middens in the permafrost.
As global temperatures rise and permafrost thaws, the breakdown of organic material in the soil is expected to accelerate. The process by which this decomposition produces heat is not well understood.
Bo Elberling and colleagues quantified microbial heat production in 21 samples of natural organic permafrost soils collected from six sites across Greenland to investigate whether enough heat can be produced by enhanced activity to affect the rate of soil decomposition.
Their model simulations reveal a feedback loop between soil temperatures and carbon decomposition that could accelerate rates of permafrost thaw and microbial heat production between 2012 and 2100.

Bill Condie
Bill Condie is a science journalist based in Adelaide, Australia.
Read science facts, not fiction...
There’s never been a more important time to explain the facts, cherish evidence-based knowledge and to showcase the latest scientific, technological and engineering breakthroughs. Cosmos is published by The Royal Institution of Australia, a charity dedicated to connecting people with the world of science. Financial contributions, however big or small, help us provide access to trusted science information at a time when the world needs it most. Please support us by making a donation or purchasing a subscription today.