We are 6.6 billion people now. We can only feed 4 billion. I don't see 2 billion volunteers to disappear.
When the faith dies, the culture it produced begins to die, then the civilization goes, and, then, the population.
The genocide will not necessarily take the form of war, or death camps. Most likely it will take the form of ecocide, in which landscapes are devastated and the populations that live there slowly starve or turn upon each other savagely because there isn't enough food or water to go around.
...the chief cause for the impending collapse of the world - the cause sufficient in and by itself - is the enormous growth of the human population: the human flood. The worst enemy of life is too much life: the excess of human life.
It is common knowledge now that we depend on insects for our continued existence; that, without key pollinators, the human population would collapse in less than a decade.
A country which does not create children is destined to die.
Island of Hispaniola once so populous (having a population that I estimated to be more than three million), has now a population of barely two hundred persons.
