Once a gas escapes into the atmosphere any gas (apart from O2, N2 and CO2) is irretrievable economocally. Helium happens to leave the planet, but so what? Heli

Once a gas escapes into the atmosphere any gas (apart from O2, N2 and CO2) is irretrievable economocally. Helium happens to leave the planet, but so what? Helium is continuously produced inside Earth, it is the alpha radiation produced by the decay of Radon. There are natural gas wells that yield up to 10% Helium. If the market demand were there (eg airships), the Helium production could probably go up by a factor of 10 or 100. https://en.m.wikipedia.org/wiki/Helium_production_in_the_United_States https://en.m.wikipedia.org/wiki/Helium_production_in_the_Uni...