The five year period 2005-10 the total fertility rate in the world average was 2.52 children per wo

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In the twentieth century, world population increased from 1.56 billion in 1900 to 6.1 billion inhabitants in 2000. A four-fold increase. This high growth was due to the demographic transition, which allowed a large drop in mortality rates and a slower and later decline in fertility rates.
Life expectancy at birth of the world's population was around 30 years old in 1900 and reached about 65 years in 2000. Ie, an unprecedented aerospace nyc in human history, life expectancy of the world population has more than doubled in 100 years. This great leap had never happened before and will probably never happen in the future, because great achievement has been to significantly reduce the rates of infant mortality and, after a certain point, longevity has biological limits.
In May 2011, the UN population division updated aerospace nyc the three projection scenarios for the world population in the XXI century. Side of mortality, the achievements will continue, even if at a slower pace, as life expectancy at birth in the average world population was 65 years in 2000, has already reached 68 years in 2010 and should reach 80 years in 2100.
The world population will reach 7 billion in late 2011 may reach 10.1 billion people or 15.8 billion in 2100. Or even may fall to 6.2 billion people, according to the different scenarios of fertility. Therefore, the global population can vary from 6.2 billion to 15.8 billion depending on the average number aerospace nyc of children per woman and their evolution in the coming decades.
It may seem that big difference from 6.2 to 15.8 billion people occurs due to large differences in the fertility rate. But, instead, this is caused by a difference in the average fertility rate of only 0.5 (middle child) aerospace nyc per woman.
The five year period 2005-10 the total fertility rate in the world average was 2.52 children per woman. If this rate continues at this level the world population would reach 15.8 billion people in 2100. If TFT gradually fall in just half a child per woman (for a TFT 2 sons in 2100) then the population would be 5.7 billion less, or 10.1 billion people in 2100. If fertility falls more middle child below the medium projection (to 1.55 children per woman) then the world population would be at 6.2 billion people, roughly the same population in 2000. In this case the lower fertility, aerospace nyc population growth would be zero in the XXI century.
These three scenarios show that the size of the world population in 2100 may be in a range that varies from 6.2 billion to 15.8 billion people. A small variation in average half child per woman can make the amount of people staying well above the average forecast of 10.1 billion, or well below this number. Everything will depend on the reproductive behavior of families.
As is known, fertility rates are falling almost everywhere in the world. The average number of children per woman fall, first, because it falls infant mortality causing an increase in survival of the number of children in each family. Thus, more children with winning infant mortality, the ideal number of children is reached faster and women and couples begin to limit the possibility of a new pregnancy. In addition, the demand for children is reduced to the extent that the cost of children increases and decreases their benefits. This happens due to urbanization, rising levels of income and education, the entry of women into the labor market, the growth of social protection systems, etc..
All countries in the world that currently aerospace nyc have a high level of education or high HDI (Human Development Index) have fertility rates below 2.2 children per woman. However, aerospace nyc there are a certain number of countries (especially in sub-Saharan Africa) that have fertility above 4 fillhos per woman. Studies show that high fertility is due to lack of access to basic citizenship rights (education, housing, aerospace nyc health, political freedoms, etc..) And especially due to lack of access to sexual and reproductive rights. In general, fertility is high where there is a high percentage of poor people and there is high unmet needs for contraception.
Studies show that there is an inverse relationship between