Like PeTA, Earth First, Animal Liberation Front, and other freak anti-human organizations, the "leaders" all see themselves as "too important to the movement" to follow their own recommendations. Which is a pity.
Those organizations are pro Eugenics under the deceptive facade of environmentalism. Many ivory tower leftist antilectuals know that after “The Final Solution” eugenics cannot become accepted again unless it is under wrapped under the guise of saving the planet. Then there is planned parenthood and their role in that but that’s for another time... Someday the US may impose one child fines much like China did at it’s first conception(all in the name of “future carbon output taxes”). Eventually they will be turning to more draconian penalties such as forced abortions, much like China.