I just know that it is the population of the First World that is in crisis. Many countries now have fertility rates of 1.3 or less, which means each of us is producing 2/3 offspring. We will be losing a third of our population every 30 years, that which is left will be skewed towards the aged and infirm, reliant on the increasingly narrow support of vigorous young people, and inverted pyramid.
It has been brought on by a cult of pessimism and narcissism which is promulgated by our media. The concept of the family has become increasingly obscure, absurd, and irrelevant. We are inundated with petitions of death.. abortion, euthenasia and the trivialization of any necessity to procreate, children now being seen as financial drains, and impediments to 'finding yourself'.
It presages a dark age, of economic collapse, deserted cities, tribal conflict, poverty, disease, technological retreat.. invasion. The West has not seen this, except for transient and localized, wars, plagues, natural disasters, famines.. since the collapse of the Roman Empire.
The collapse of population is a frightening and catastrophic event for any civilization. I suggest we look at our own problems before worrying about those of Asia or Africa.