Update zoning? Humans are breeding creatures. Like all animals, they will reproduce to fill their available habitat and back pressure is needed to keep the population from strangling this planet.
No one looks up the zoning code before having kids. Zoning is also not related to the carrying capacity of an environment, usually its decided by busybodies who actively ignore the literature on the subject in favor of perpetuating a status quo.
My understanding is that it's been proven over and over, the world over, the way to slow population growth is to educate, especially women, and provide easy access to family planning / birth control.
