The world in 2050: more crowded, urban and aged.

Abstract

The world's population -- with today's 6.1 billion already more than twice the 1950 figure -- is likely to grow by another 3 billion in the next half-century, according to a recently released UN projection. Most of the population growth will occur in the less developed countries of Africa and Asia, despite the staggering death toll of the AIDS epidemic in these countries. In contrast, populations in all but a few industrialized countries will remain stable or even shrink. What's more, medical progress will allow people to live longer and thus steadily increase the percentage of retirees in the years to come. These are the conclusions of World Population Prospects: the 2000 Revision, the sixteenth round of global demographic estimates and projections made by the UN Population Division since 1950. Altogether, Mr Joseph Chamie, director of the UN Population Division that compiles the population projections, told the Bulletin "the world's population will be very different in 50 years. It will be substantially larger, especially in the developing countries, significantly older and much more urbanized." The world's population is currently growing at a rate of 1.2%, or 77 million people, per year with six countries accounting for half of the growth: India (21%), China (12%), Pakistan (5%), Nigeria (4%), Bangladesh (4%,), and Indonesia (3%). Although fertility rates are coming down in every region and in virtually every country of the world, Chamie points out, by 2050 the overall figure is anticipated to swell to 9.3 billion, and nearly nine of every ten people will be living in a developing country -- one out of six in India alone, which will replace China as the most populous nation. Taken together, the population of the world's less developed nations is expected to grow from 4.9 billion to 8.1 billion. In sub-Saharan Africa, the number of people could even triple. But this is only one side of the coin. For the more developed countries as a whole, population growth is likely soon to come to a standstill at the current 1.2 billion level, according to the UN projection. Notable exceptions, however, are several industrialized countries, such as Australia, Canada and the US, that are projected to be at least a third larger by 2050 than they are today. By mid-century the populations of 39 developed countries are likely to be even smaller than today, e.g. Japan and Germany by 14%, Italy and Hungary by 25%, and countries of the former Soviet Union by 30-40%, leading to a shift in balance. Fifty years ago, when Europe claimed about 20% of the world's population, Africa amounted to just 8%. In 50 years, however, Africa will have three times as many people as Europe, even though AIDS is anticipated to cut Africa's population growth by 15%. …