Seven types of viruses that have lain frozen in the Siberian permafrost for thousands of years have been revived. The youngest were frozen for 27,000 years, while the oldest was on ice for 48,500 years – making it the most ancient virus resuscitated so far. One-quarter of the Northern Hemisphere is underlain by permanently frozen ground, referred to as permafrost. Due to climate warming, irreversibly thawing permafrost is releasing organic matter frozen for up to a million years, most of which decomposes into carbon dioxide and methane, further enhancing the greenhouse effect. Part of this organic matter also consists of revived cellular microbes (prokaryotes, unicellular eukaryotes) as well as viruses that remained dormant since prehistorical times.
— source newscientist.com | 23 Nov 2022