April 2, The Future of World Religions: Over the next four decades, Christians will remain the largest religious group, but Islam will grow faster than any other major religion.
After reaching this maximum, it would decline slightly and then resume a slow increase, reaching a level of 8. Total fertility is assumed to continue to decline, at varying paces depending on circumstances in individual countries, to a below-replacement level of 1.
Countries already at this level or below, and other countries when they reach it, will eventually return to replacement over a period of a century and stay at replacement going forward.
All countries are projected to have reached replacement fertility by Some of the authors of the UN report say that life expectancy is assumed to rise slowly and continuously.
The projections in the report assume this with no upper limit, though at a slowing pace depending on circumstances in individual countries. Bythe report assumed life expectancy to be from 66 to 97 years, and by from 87 to years, depending on the country.
Based on that assumption, they said that rising life expectancy will produce small but continuing population growth by the end of the projections, ranging from 0. The hypothetical feasibility and wide availability of life extension by technological means would further exacerbate the overpopulation problem.
The study projects the world population in to be 8.Data on population growth – including projections – can be found in the data section of the entry on world population growth.
Footnotes This is described in Samir KC and Wolfgang Lutz () – The human core of the shared socioeconomic pathways: Population scenarios by age, sex and level of education for all countries to 4) Half of the world’s population growth will occur in just 9 countries This was the most interesting set of findings for me.
Within seven years (by ), the population of India will overtake that of China, and will reach billion by Oct 01, · In addition to making projections at the global level, this report projects religious change in countries and territories with at least , people as .
During , half of the world’s population growth is expected to be concentrated in nine countries: India, Nigeria, Pakistan, Democratic Republic of the Congo, Ethiopia, United Republic of Tanzania, United States of America (USA), Indonesia and Uganda, listed according to the size of their contribution to the total growth.
Dueling projections of population growth present different visions of the world's future.
Sub-Saharan Africa will see most of the world's population growth in the next century. years ago there were less than one billion humans living on earth.
Today, according to UN calculations there are over 7 billion of us.1 Recent estimates suggest that today's population size is roughly equivalent to % of the total number of people ever born.2 This is the most conspicuous fact about world population growth: for thousands of years, the population .