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What is "artificial oxygen"? That doesn't make any sense. — Preceding unsigned comment added by 67.170.9.130 (talk) 18:32, 15 October 2020 (UTC)[reply]
The main theme is that heating the planet to half of the overheating of the lush Cretaceous will wipe out all plants. "With all plant life on Earth extinct", there is no photosynthesis, so no natural renewing source of oxygen; so, the conjecture its that Oxygen made available through industrial water splitting (probably) of some form. IveGoneAway (talk) 18:53, 2 December 2020 (UTC) 20:13, 2 December 2020 (UTC)[reply]