Pathogens

CNN  —  As the climate warms, scientists have suggested that “time-traveling pathogens” unleashed by thawing Arctic permafrost may pose a risk to modern ecosystems. Permafrost is a hard layer of frozen ground made of soil, sand and rocks in high-latitude or high-altitude areas such as Greenland, Alaska, Siberia, the Tibetan Plateau and northern Canada. This icy layer traps …

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