As an adviser to demographers, I don’t really worry about overpopulation. I worry about underpopulation. In WORLD POPULATION TO 2300, the UN releases it’s predictions:
Long-range population projections are reported to 2300, covering twice as long a period as ever covered in previous United Nations projections. These projections are not done by major area and for selected large countries (China and India), as was the previous practice, but for all countries of the world, providing greater detail.
In these projections, world population peaks at 9.22 billion in 2075. Population therefore grows lightly beyond the level of 8.92 billion projected for 2050 in the 2002 Revision, on which these projections are based. However, after reaching its maximum, world population declines slightly and then resumes increasing, slowly, to reach a level of 8.97 billion by 2300, not much different from the projected 2050 figure.
I’ve heard of other predictions that world population will actually go into a precipitous decline. We see the start of that in European nations and in the US, where the birth rate is already below the rate necessary to keep population at the same level. The only thing counteracting this in these countries is immigration.
In a mere fifty years, all families in Western nations will see significant incentives to have more children, as they do now, in France and Germany and Japan, I believe. If Italy doesn’t have such incentives, it ought to, since its population has experienced the most dramatic declines.
Seriously, these groups are too small to make even a statistical difference on the population meter. This is not how they will spread their ideology.