https://www.livescience.com/earth-without-people.html
https://www.vice.com/en/article/nnkz5k/what-would-happen-if-young-people-stopped-having-babies
https://en.wikipedia.org/wiki/Voluntary_Human_Extinction_Movement
https://en.wikipedia.org/wiki/Human_extinction
https://en.wikipedia.org/wiki/Sub-replacement_fertility
https://en.wikipedia.org/wiki/Human_cloning