@cicerone imposter,
Below in the UN figures and the 2050 world population is expect to grow from the current 6 billions to 7.9 billions to 10.9 billions and even the higher figure is not a doubling.
With China alone dropping birth rate I would bet we do not reach even the 7.9 billions level but that is just my feeling.
In any case, a large portion of the world the population will be declining not inclining and the birth rate is expect to be falling into the future.
No science fiction story such as “Make room make room” is going to occur
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Among the key findings of the 2000 Revision are:
1. World population reached 6.1 billion in mid-2000 and is currently growing at an annual
rate of 1.2 per cent, or 77 million people per year. Six countries account for half of this
annual growth: India for 21 per cent; China for 12 per cent; Pakistan for 5 per cent;
Nigeria for 4 per cent; Bangladesh for 4 per cent, and Indonesia for 3 per cent. By 2050,
world population is expected to be between 7.9 billion (low variant) and 10.9 billion
(high variant), with the medium variant producing 9.3 billion (figure I).
2. The population of more developed regions, currently 1.2 billion, is anticipated to change
little during the next 50 years because fertility levels are expected to remain below
replacement level1.
However, by mid-century the populations of 39 countries are
projected to be smaller than today (e.g., Japan and Germany 14 per cent smaller; Italy and
Hungary 25 per cent smaller; and the Russian Federation, Georgia and Ukraine between
28 to 40 per cent smaller).3. The population of the less developed regions is projected to rise steadily from 4.9 billion
in 2000 to 8.2 billion in 2050 (medium variant). This projection assumes continuing
declines in fertility; in the absence of such declines, the population of less developed
regions would reach 11.9 billion instead of the projected 8.2 billion. Particularly rapid
growth is expected among the group of 48 countries classified as least developed. Their
population is expected to nearly triple between 2000 and 2050, passing from 658 million
to 1.8 billion, despite the fact that their fertility is projected to decline markedly in the
future.
4. The difference between the projected population in 2050 according to the 2000 Revision
(9.3 billion) and that projected in the 1998 Revision (8.9 billion) is 413 million people.
Higher future fertility levels projected for the 16 developing countries whose fertility has
not yet shown signs of a sustained decline are responsible for 59 per cent of that
difference. The somewhat higher recent fertility estimated in the 2000 Revision for
several populous countries (e.g., Bangladesh, India and Nigeria) accounts for a further 32
per cent of that difference.
5. For 1995-2000, life expectancy at birth in the more developed regions is estimated to be
75 years. In the less developed regions, life expectancy was nearly 12 years lower, at 63
years. By 2050 the less developed regions are expected to attain a life expectancy of 75
years whereas in the more developed regions the projected level is 82 years, implying
that the gap between the two groups may narrow.
1 Replacement-level fertility is the level necessary to ensure that the population