A. World Population Growth: see text figs [human population* & exponential model* &  sigmoid-curves*]
               Unlimited population growth (exponential growth) assumes unlimited resources (?)
               zero population growth occurs when per capita birth rate = death rate
               carrying capacity is the maximum population size that a particular environment can support.
   
                                                    EARTH...   what is its carrying capacity?     and      how will it be achieved?

population projection rates?     &  U.N. World Projection figures  &    U.S. Census data tables*                                                              Country Projections*               &    Industrial vs. Non-industrial              Replacement Level Fertility -                     World Replacement Level Fertility (1996)               a definition...  *                     U.S. Fertility 1900 to 2000*      population #'s based on RLF's                                                                          Fertility & Contraception (2000)*  a look at U.S. fertility 1940-2005
Population Pyramids -                                               a definition... *	Age Structure Diagrams* World population pyramids Individual country pyramids*
Quick population estimates                        The U.N. Population Database       World Population Clock site       U.S. Population Clock site                        Campbell Concept Activity: Age Structure Pyramids*       Unique World Population Facts         back

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