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KingVolsung t1_ixayqro wrote

Rebreathers are not sustainable, they require a supply chain to be able to keep using them. The scale of the supply chains required to keep humanity alive in such a situation is far beyond what can be achieved through bunkers.

The only way we could survive such a situation is where the environment will become survivable within decades, which in evolutionary/geological timescales is a blink of an eye.

No one is building and preparing bunkers for surviving centuries to millennia, because it's not feasible.

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