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Of course, a positive growth rate might be taken as evidence that a population is below its optimum.

The point of our demographics is that we're not having as many children and the population is stagnant, if not declining. So without immigration, we're not going to have the population.

The good news is world population growth rate decreases systematically and is expected to reach zero by 2050, thanks to urbanisation and women's education.

By improving health, empowering women, population growth comes down.

Social services, not wealth per se, seem to be the key to lower birth rates. The Chinese, although among the poorest peoples of the world, have brought their fertility rate down to 2.4, partly by social coercion, but mostly by broadly available education, health care and family planning.

It is simply a fact that the birth rate of our illegal immigrants exceeds that of our legal residents.

A series of studies in the 1990s and 2000s revealed that as women gained more access to education, jobs, and birth control, they had fewer children. As a result, developed countries in western Europe, Japan, and the Americas were seeing zero or negative population growth.

We know from hard research that educated populations have lower growth rates, are more peaceful, and add to the global economy.

Africa is underpopulated. We have 20% of the world's landmass and 13% of its population.

In Washington State, the immigrant population has grown by 42 percent in the five years between 2000 and 2005 - which is an increase from 8 percent to 10.6 percent of the overall population - and the jobless rate in the state has hit a 6 year low.