Well, there is; you can just wait for more helium to be produced underground. That's the same method that provided the helium we have now.
> Well, there is; you can just wait for more helium to be produced underground.
Funnily enough that seems to be the same idea for petroleum. :)
> Well, there is; you can just wait for more helium to be produced underground.
Funnily enough that seems to be the same idea for petroleum. :)