As per world population data ,
China ranks first, followed by India, followed by United states and Indonesia.
Global population increased to 6.9 billion in 2010, with nearly all of that growth happening in the world's developing countries.
There are 1.2 billion people in the world's developed countries,
in these countries, populations continue to age as the numbers of those of working age dwindle.
Japan :fertility rate of 1.4 children per woman,
elderly support ratio of 3—the lowest in the world, along with Germany and Italy.
By 2050, Japan there will be only 1 working-age adult for every elderly person; Germany and Italy will each have 2.
More than 2.7 billion people worldwide , lack access to an adequate sanitation facility most of whom live in rural areas in developing nations.
As the U.S. population ages, spending on entitlement programs such as Social Security and Medicare will rise sharply.
If its fertility rate is not brought down,Africa's population is projected to double to 2 billion by 2050 or even more.
European Union's overall population is projected to increase slightly between 2005 and 2030, most of which will be due to net immigration.
Natural increase (the ratio of births over deaths) will turn negative for the EU in 2010.
And the vast majority of Europe's countries—including Belgium, the Czech Republic, Germany, Italy, Poland, and Russia—are projected to lose population in the next 25 years.
Courtesy:Population Reference bureau
www.prb.org
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