Engineer: Some people argue that the world' s energy problems could be solved by mining the Moon for helium-3, which could be used for fuel in fusion reactors  But this is nonsense  Even if it were possible to mine the Moon for helium-3, the technology needed to build viable fusion reactors that could use such fuel is at least 50 years away
If the world' s energy problems are not solved before then, it will be too late to solve those problems
if the world's energy problems are not solved within the next 50 years, it will be too late to solve those problems