The clathrate gun is in a different category. On a large enough scale it would probably eliminate most agriculture and fishing as sources of food production and return the Earth to one of its earlier desert states - a blistering, wind-scoured landscape of barren rock and sand. Whether a handful of humans might cling on amid the wreckage is unknowable - but if the Permian is anything to go by, then we’d have about three chances in ten of doing so.
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