Nobody is going to solve the problem of overpopulation.
Scientists have yet to put me in a flying car and send me to the moon so I have little faith that they can find the end all in overpopulation.
All other "solutions" are too distasteful. Forcing humans to breeding limits? We are appalled at the thought. Collectively killing off sects of the population? I really don't think that's even an option. Overpopulation requires hard answers to hard questions and that's not possible in this soft society. Everyone has the right to breed, no matter how many of us may disagree.
Eventually disease, pestilence, famine and so forth are going to have to regulate the population. Of course, the question is how many folks is too many folks?