[simonh]

We can extract oxygen from water right now, so we can already do this. Requiring a specific implementation technology is unreasonably stacking the deck.

You’re making the same mistake as those who critiqued the concept of heavier than air flying machines, starting from the assumption they must work by flapping their wings. As it happens now we have wing flapping drones anyway though.

“Ever” is a very, very, very long time.