So simple, yet every time I try to explain it I run into people who claim it is inhumane to limit human population growth. Half the world is starving already, water is in short supply yet we are unable or unwilling to cap the number of humans Earth can sustain. I read many articles asking, how can we feed 20 billion? They claim science will come through. It’s as if they can visualize a limit. I believe we need to limit birth until we cut the population is half. One voucher per woman worldwide, use it, sell it, trade it a woman's choice.