Yeah, it’s not a practical solution in terms of implementation. However, if implemented it would work and not require Star Trek levels of innovation. There are simply too many people in the world.
Okay...but how would that work? Where are all these people? China had a one-child policy which they've recently reversed because the ratio of old people/young people has basically reversed. On the plus side it seems that with education and generally societal improvements people tend to have less children anyway. Having said that in some developed countries they're struggling with declining birth rates. Partly because of lifestyle choices and partly due to high costs of raising children...
I mentioned that it's not practical. Forced sterilization - I'm not advocating this - would do the trick. Again, it's not practical to implement just now but I think it's clear that having fewer people would be ideal and would solve lots of problems.