If people will not practice birth control for whatever reason and if governments are loathe to enforce birth control while they allow the environment to deteriorate (yes, Trump, I am thinking of you), then the only solution is Malthusian: Let people struggle for resources and let the winners survive.
Links
[1] https://paw.princeton.edu/node/add/inbox?field_in_response_to=180841
[2] http://www.facebook.com/share.php?u=https://paw.princeton.edu/inbox/if-people-will-not-practice&title=If people will not practice...
[3] http://twitter.com/intent/tweet?status=If people will not practice...+https://paw.princeton.edu/inbox/if-people-will-not-practice
[4] https://paw.princeton.edu/print/180841
[5] https://paw.princeton.edu/printmail/180841
[6] https://paw.princeton.edu/article/economics-population-less-more
