Scott Alexander analyzes the threat of ancient diseases from thawing permafrost, arguing that recent human plagues pose a greater risk than prehistoric ones.
Longer summary
Scott Alexander discusses the potential threat of ancient diseases reemerging from thawing permafrost due to climate change. He argues that diseases from millions of years ago are unlikely to pose a significant threat to humans, as they would not be adapted to human biology. However, he expresses more concern about recent human plagues like the 1918 Spanish flu or smallpox potentially coming back. Scott explains that while there's no evidence of live smallpox virus found on artifacts or corpses, the possibility of viruses surviving in permafrost can't be ruled out entirely. He concludes that the biggest risk might come from scientists investigating these potential threats rather than natural exposure.
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