Permafrost, The Climate Change Time Bomb

As North America freezes through a polar vortex, and Australia sweats out an extreme heatwave, there is growing consensus it could be game over for Planet Earth if we do not pay attention to the world’s permafrost. Permafrost is a layer of soil, rock or sediment that is frozen for more than two consecutive years. It is commonly found in snowy, high-altitude mountains. About a quarter of the entire northern hemisphere has permafrost, but it is especially prevalent in areas above the 50th parallel north. Credits: Marco Hernandez & Pablo Robles for South China Morning Post, 21 February 2019.

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