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Since the early 1800s, the human population on Earth has been growing exponentially. Current world population estimate

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Since the early 1800s, the human population on Earth has been growing exponentially. Current world population estimate

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    1. Since the early 1800s, the human population on Earth has been growing exponentially. Current world population estimate is: 6,404,307,344 people as of December 4, 2004

    2. Human Population History

    3. In 1850, the human population reached its first billion. By 1930, it was 2 billion. By 1960, the human population reached 3 billion. Then in 1975, 4 billion, and so on…

    4. The human population is now growing at a rate of about 3 people/second or 260 thousand/day or 1.8 million per week or 93 million/year

    5. Each dot represents 1 million people

    7. Birth/Death Rates When a substantial proportion of a country's population is young, high population growth rates in a country are to be expected, even if the average total fertility rate is modest. The reason is that so many females are of childbearing age, that even a modest average total fertility rate results in a large number of births.

    8. Total fertility rate (TFR) - estimate of the average number of children a woman will have during childbearing years In 1995, the TFR was 3.1 children per woman; still far above replacement level (1.6 in MDCs & 3.5 in LDCs)

    9. At or below replacement level (2.1) since about 1972 because: widespread use of birth control availability of legal abortion social attitudes favoring small families increasing cost of raising a child to age 18 ($177,000 for low-income family, $231,000 for middle-income & $335,000 for upper-income) increase in average age of marriage between 1958 & 1992 (from 20 to 24.4 for women, and from 23 to 26.5 for men) More women working outside home (child-bearing rate of "working" women 1/3 that of women not in paid labor force) delayed reproduction

    10. Personal hygiene and improved methods of sanitation have played a major role and preceded the impact of modern medicine and, in particular, the development of antibiotics capable of reducing death due to infection.

    11. Carrying capacity- the maximum population that can be supported by the available resources. Biological Carrying Capacity about 50 Billion We strive for a modified population at which a maximum population can be maintained at an acceptable standard of living- Cultural Carrying Capacity.

    12. According to the latest United Nations projections, the most likely scenario for population in 2050 will be around 8.9 billion, and will peak out slightly above 10 billion after 2200.

    14. As population grows, consumption of valuable resources and pollution increases, which threatens to overwhelm the Earth’s ability to provide for the human race and other life forms. Overpopulation creates low living standards,  outbreaks of civil wars, not enough jobs, poor food supplies, and reduced education standards. 

    15. As a result of this rapid growth: Approximately 1.3 billion of the world's people are impoverished, living on the equivalent of less than 1 dollar a day. And as population steadily increases, the gap between rich and poor is widening. Some 60% of the 4.8 billion people in developing countries lack basic sanitation, and almost one-third have no access to clean water. Nearly 1 billion people in the world are illiterate, two-thirds of them women. To resolve the problem of overpopulation, it will take a combined effort of the developed and developing countries to better the conditions of the whole planet, not just specific countries.

    16. Global fertility rates have declined more rapidly than expected, as health care, including reproductive health, has improved faster than anticipated, and men and women have chosen to have smaller families.  About one-third of the reduction in long-range population projections, however, is due to increasing mortality rates in sub-Saharan Africa and parts of the Indian subcontinent. The most important factor is HIV/AIDS, which is spreading much faster that previously anticipated.

    17. 1) Train and educate the people of developing countries so that they can pursue industrialization.  As they progress, they will be less dependent on other countries for assistance. 2) Educate the people in how to manage their existing natural resources sustainable. 3) Demonstrate to the people how their natural resources can be used to generate income (example:  ecotourism and its associated benefits). 4) Consider means of financing industrialization efforts.  This an be in the shape of loans,  outright gifts,  etc.  from countries which are already developed. 5) Educate the developing countries about agriculture.  Help them discover which crops can be successfully grown in their climates and teach them how to grow these crops so that they will be less dependent on outside aid for food. 6) Educate the people about the effects of overpopulation on their own nation. 7) Provide information on birth control methods and finance projects to provide this technology to the people. 8) Assist the countries in offering their own incentives to their citizens to reduce the birth rate (example:  tax cuts for families which voluntarily have less children).

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