En-en adult card 41 permafrost
Card #41: Permafrost
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Permafrost is permanently frozen ground.
Permafrost thawing leads to the decomposition of organic matter previously frozen underground, a phenomenon that releases methane and CO2 into the atmosphere.
Beyond +2°C, it is almost certain this phenomenon will accelerate and make the climate spiral out of control.
Explanation
Permafrost is soil that is permanently frozen for at least two consecutive years[1].
The two last cards to be added to the Collage after card 40 are potentially violent feedback loops or "climate bombs" which, if triggered, would cause us to lose control over the climate for good.
Thermokarst are veritable bioreactors at the heart of the process of releasing frozen carbon: when the permafrost thaws, pieces of soil detach and fall into the water, bringing nutrients and carbon to the bacteria and plankton present in the sea, which degrade them into CO2 (in the water layers near the surface) and methane (CH4 -- in the oxygen-deprived bottom)[2].
Correction
Causes
Consequences
Other possible links
Other causes
Energy budget If we take the idea of energy conservation all the way, we can link the thawing of permafrost and methane hydrates back to the energy budget.
To go further
For online murals, you can show this video from the University of Alaska Fairbanks showing the flammable methane stored in the permafrost.
Climate Action Network France: Thawing permafrost carbon will increase global warming, 2018 (French)
RT France documentary: The mystery of permafrost (French)