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Why aren't there any scifi movies where humans become anaerobic again?

Like our microbial ancestors. The backstory would be that ox...
https://imgur.com/a/o2g8xYK
  01/06/26
Waterworld
No Paye No Gain
  01/06/26
Those folks became aquatic but they were still aerobic. Anae...
https://imgur.com/a/o2g8xYK
  01/06/26


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Date: January 6th, 2026 6:58 PM
Author: https://imgur.com/a/o2g8xYK


Like our microbial ancestors. The backstory would be that oxygen levels plummeted and we had to adapt to survive, but we already had this capability leftover from 3 billion years ago. Among other things it would be very hard to start fires in this environment but there'd also be much less risk of electrical fire. Pretty safe to assume all fuel-burning engines just wouldn't work without supplemental oxygen

(http://www.autoadmit.com/thread.php?thread_id=5818112&forum_id=2\u0026mark_id=4973486#49567646)



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Date: January 6th, 2026 7:12 PM
Author: No Paye No Gain

Waterworld

(http://www.autoadmit.com/thread.php?thread_id=5818112&forum_id=2\u0026mark_id=4973486#49567666)



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Date: January 6th, 2026 7:14 PM
Author: https://imgur.com/a/o2g8xYK


Those folks became aquatic but they were still aerobic. Anaerobic life is more likely to live off thermal vents and not have gills IMO.

(http://www.autoadmit.com/thread.php?thread_id=5818112&forum_id=2\u0026mark_id=4973486#49567669)