Voluntary Extermination

Oh it's real.

http://www.vhemt.org/aboutvhemt.htm#vhemt

An environmental group says it’s sole purpose is to recruit volunteers and educate enough people to eventually realize that the human race needs to completely die out in order that the planet can survive.
The Voluntary Human Extinction Movement (VHEMT) says humans need to stop breeding and voluntarily progress our own slow demise in order that plants, animals and fragile ecosystems can survive.
The group’s motto is "May we live long and die out". Their website explains their commitment to a long term goal of convincing the population of Earth that it has no future:

It has been suggested that there are only two chances of everyone volunteering to stop breeding: slim and none. The odds may be against preserving life on Earth, but the decision to stop reproducing is still the morally correct one. Indeed, the likelihood of our failure to avoid the massive die off which humanity is engineering is a very good reason to not sentence another of us to life. The future isn’t what it used to be.
Even if our chances of succeeding were only one in a hundred, we would have to try. Giving up and allowing humanity to take its course is unconscionable. There is far too much at stake.
The Movement may be considered a success each time one more of us volunteers to breed no more.