Permafrost is ground that has been permanently frozen for two or more years. Covers 20% of the Earth's land surface
Areas of permafrost are natural sinks of CO2. It's stored as organic material in the soil. Thawing permafrost releases some of this, contributing to global warming.
Thawing of permafrost causes the collapse of buildings and pipelines built on it. May bring economic benefits to humans because it's easier to extract natural resources from the land when it's unfrozen.
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