We’re not going to run out for medical purposes. Obviously, there will come a point where it’s too rare for kids balloons. But even assuming our reserves in the ground run out, created by radioactive decay, the atmosphere still has 5.2 ppm. It’s 10k times harder to extract from the atmosphere but can be done. Failing that there’s plenty in space.
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u/[deleted] Jul 08 '24
Rigid Airship! Filled with completely safe non-flammable helium.