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flag Scientists revived 40,000-year-old microbes from thawing Alaskan permafrost, raising climate concerns.

flag Scientists have revived microbes from permafrost in Alaska that had been frozen for up to 40,000 years, with activity only becoming noticeable after about six months of thawing. flag Using deuterium-labeled water, researchers tracked slow microbial growth, eventually seeing visible biofilms form. flag The study, published in September 2025, found that prolonged warming, not short heat spikes, likely drives increased microbial activity and potential greenhouse gas emissions. flag While the revived microbes pose no known health risk, their reactivation highlights concerns about climate change accelerating permafrost thaw and releasing stored carbon. flag Results from one Alaskan site may not reflect global patterns, so further research is needed across Arctic regions.

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