Scientists fear 'time-traveling' pathogens could be leaked into the world as their icy prison in permafrost is melting - and they could spark the next planet and destroy the environment.Ancient viruses, sealed in permafrost for thousands of years, could survive and evolve to become the dominant free-living species- killing up to one-third of bacteria-like hosts.The stark revelation was made by researchers at the European Commission Joint Research Center, who used computer simulations to find about three percent of virus-like pathogens became dominant after being released from the ice.
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