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* [[En-en adult card 41 permafrost|Permafrost]] If we take the idea of energy conservation all the way, we can link the energy budget to the thawing of permafrost. | * [[En-en adult card 41 permafrost|Permafrost]] If we take the idea of energy conservation all the way, we can link the energy budget to the thawing of permafrost. | ||
== To go further == | == To go further == |