What someone needs to do is build a stasis field like in Half-Life 2 that makes everyone sterile.
Problem solved.
The Chineese are mandating population control as we speak --sterilization and abortion are not so much a matter of personal choice but a matter of public law. Chineese women are not allowed more than one child each.
And since males are the preferred sex in chineese culture, girl babies are often aborted shortly after being discovered by ultrasound. Thus the couple may continue shooting for their manchild.
The ultimate result will be a new China, with curiously few women, ruled by an entire generation of spoiled, A-Type, sex hungry, men --the best recipe for war in world history.
Throw in the nukes and you have the solution to world population.