This article is divided into sections: individuals, communities, nations, and the world. For individuals, courses of action to prevent further overpopulation include adopting instead of having kids, voting for politicians who understand overpopulation, and spreading these solutions to others. Communities can create set aside land for nature preserves, pass resolutions to reduce population growth, and discourage sprawl development. Nations can fund family planning programs, raise the legal marriage age, and ensure that contraception is legal, free, and available.
My sources and annotations:
https://nowcomment.com/documents/308316
