World population projections

A most interesting graph, discussed at some length in the New York Times.

The population of the world, long expected to stabilize just above 9 billion in the middle of the century, will instead keep growing and may hit 10.1 billion by the year 2100, the United Nations projected in a report released Tuesday.

Growth in Africa remains so high that the population there could more than triple in this century, rising from today’s one billion to 3.6 billion, the report said — a sobering forecast for a continent already struggling to provide food and water for its people.

The new report comes just ahead of a demographic milestone, with the world population expected to pass 7 billion in late October, only a dozen years after it surpassed 6 billion. Demographers called the new projections a reminder that a problem that helped define global politics in the 20th century, the population explosion, is far from solved in the 21st...

The projections were made by the United Nations population division, which has a track record of fairly accurate forecasts...

One message from the new report is that the AIDS epidemic, devastating as it has been, has not been the demographic disaster that was once predicted...

Some studies suggest that providing easy, affordable access to contraceptives is not always sufficient.... general education for girls plays a critical role, in that literate young women are more likely to understand that family size is a choice.

The new report suggests that China, which has for decades enforced restrictive population policies, could soon enter the ranks of countries with declining populations, peaking at 1.4 billion in the next couple of decades, then falling to 941 million by 2100.

The United States is growing faster than many rich countries, largely because of high immigration and higher fertility among Hispanic immigrants. The new report projects that the United States population will rise from today’s 311 million to 478 million by 2100.