1) The world population will continue growing significantly despite falling fertility rates, reaching 9 billion by 2027 and over 10 billion by 2048. 2) Most of this population growth will occur in developing countries in Asia, Africa, and South America. India will surpass China as the world's most populous country. 3) The top 10 countries contributing to population growth over the next 30 years are India, China, Pakistan, Nigeria, Ethiopia, Indonesia, United States, Bangladesh, DR Congo, and Iran. Western Asia and Africa south of the Sahara will see the highest growth rates.

1. World Population Growth, in Billions Number of years to add each billion (year) All of Human History (1800) 130 (1930) 30 (1960) 15 (1975) 12 (1987) 12 (1999) 14 (2013) 14 (2027) 21 (2048) Sources: First and second billion: Population Reference Bureau. Third through ninth billion: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005.

2. World, 1950 - 1995: Total Population (in billion) and Average Number of Children (Total Fertility Rate, TFR) High, Medium and Low Variants Headline: World population will grow significantly - despite falling fertility!

3. Millions Annual Increase in World Population Source: United Nations, World Population Prospects: The 2004 Revision , 2005.

4. Headline: the current annual population increase of about 80 million will remain constant until 2015.

5. Headline : Between now and 2050 world population growth will be generated exclusively in developing Countries

6. Headline: World population increase is concentrated in Asia.

7. Headline: The ten countries which will contribute most to world population growth over the next 30 years are India , China, Pakistan , Nigeria , Ethiopia , Indonesia, United States of America, Bangladesh, Zaire , and Iran - in that order!

8. Headline: By far the highest rates of population growth can be found in Western Asia and Africa South of the Sahara.

9. Headline: India will out-grow China.

10. Headline: Nigeria and Pakistan: emerging population giants

11. Headline: The global balance of population has shifted significantly between 1950 and 1995. It will change even more dramatically between now and 2050.

12. Headline: Worldwide , the population will age.

13. What is IIASA? The International Institute for Applied Systems Analysis (IIASA) is an international research organization located near Vienna, Austria. The institute conducts inter-disciplinary scientific studies on environmental, economic, technological and social issues in the context of human dimensions of global change. It is sponsored by its National Member Organizations in Africa, Asia, Europe, and North America.