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Abstract After more then 200 years of industrial revolution and growth the human economy has come to threaten the workings of nature and has put long-term survivorship and demography in great danger Globally the world is witnessing unprecedented changes in population structure Questions arise about environmental problems getting worse population related diseases increasing if AIDS continues to increase and no cure is found what happens and if Medical advances continue will most diseases and infant mortality be eliminated is the world going to be OK Introduction Nature has its own economy a complex system of exchange competition and cooperation In many ways natures economy is like our economy For example the economy of nature contains producers and consumers and avenues of exchange between them food chains and webs Chiras 1995 But lest we forget the human economy is really only the smaller economy in nature The human economy is possible only because of nature All food and materials come from the soil water air and biota Ultimately our wealth is derived from earth Unfortunately the human economy has grown so dramatically that it is destroying the larger economy that powers it says Chiras 1995 After more then 200 years of industrial revolution and growth the human economy has come to threaten the workings of nature and has put long-term survivorship and demography in great danger Demography is the study of the internal composition of populations and the effects of that composition on the population growth Microsoft Encarta 2000 Age is an important structuring component for many populations because fertility and survivorship frequently vary with age One species whose fertility and survivorship is affected by age is humans Homo sapiens There are three types of survivorship curves that can be analyzed A Type 1-curve shows that there is low initial mortality and many individuals are going to live to an older age According to the United Nations globally the world is witnessing unprecedented changes
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