At approaching a billion now, there could be the best part of three billion with no means of support and therefore potentially expected to starve or to slaughter one another. Not to speak of South Asia where the population of India is expected to double, and which can barely feed itself now. Added to which global per capita grain has been falling since the mid 1980s. Since 1990 the percentage increase in global grain yield has been below what all expert projections consider necessary. From which one has to conclude that both demography and development economics have reached the point of farce - and tragedy.
Farce is merely risible.
With Rwanda as only a foretaste, Malthusian tragedy on the scale of a continent and more, is going to go down in history as the greatest disaster of all time, far surpassing in deaths even two world wars. In matters demographic you demographers are the guardians of the public mind. If you dare not debate entrapment, you can hardly expect the public to, nor can you expect the UN agencies to frame remotely realistic global population policies. Its ability to migrate. The ability of its economy to generate sufficient exports, and therefore adequate imports, especially food, to prevent it from proceeding to starvation and slaughter.