3 World Population Growth Through History Billions12112100109ModernAge8OldStoneBronzeIronMiddle7AgeNew Stone AgeAgeAgeAges62000Future54197531950219001Black Death—The Plague18001+ million7000600050004000300020001000A.D.A.D.A.D.A.D.A.D.A.D.yearsB.C.B.C.B.C.B.C.B.C.B.C.B.C.110002000300040005000Source: Population Reference Bureau; and United Nations, World Population Projections to 2100 (1998).
4 World Population Growth, in Billions Number of years to add each billion (year)All of Human History(1800)130 (1930)30 (1960)15 (1975)12 (1987)12 (1999)14 (2013)14 (2027)21 (2048)Sources: First and second billion: Population Reference Bureau. Third through ninth billion: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005.
9 Trends in Population Growth Worldwide Population Increase and Growth Rate, Five-Year PeriodsPercent increase per yearMillionsThis figure illustrates the lag between changes in the rate of growth and the net increase in population per year.Over the period , the population growth rate declined (a reflection of declining fertility), yet millions of people were added to the world’s population (which peaked around 1985, when 87 million people were added each year).From 2000 on, the growth rate will continue to decline. Between 2015 and 2020, we will still be adding 72 million people each year. Why? Because the generation of women now having their children is very large as the result of high fertility in their mothers’ and grandmothers’ generations.Source: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005.
10 World Population Clock 2005Natural Increase perWorldMore Developed CountriesLess Developed CountriesLess Developed Countries (less China)Year80,794,2181,234,90779,559,31171,906,587Day221,3543,383217,971197,004Minute1542151137Source: Population Reference Bureau, 2005 World Population Data Sheet.
11 Projected Population Change, by Country Percent Population Change,Source: Population Reference Bureau, 2005 World Population Data Sheet.
12 Population Distribution Where are the world’s population clusters?
13 Distribution of World Population Population concentrationsThe four largest population clustersEast Asia, South Asia, Southeast Asia, Western EuropeOther population clustersSparsely populated regionsDry lands – Cold landsWet lands – High landsPopulation densityArithmetic densityPhysiological densityAgricultural density
14 Population concentrations The four largest population clustersEast Asia, South Asia, Southeast Asia, Western EuropeOther population clusters
22 EcumeneThe inhabited areas of the world, as opposed to the non-ecumene which is sparsely or not at all inhabited.The ecumene of a nation is its more densely inhabited core.These very simplified classifications pose difficulties of delimitation.
23 Expansion of the Ecumene 5000 BC - 1900 AD Fig. 2-3: The ecumene, or the portion of the earth with permanent human settlement, has expanded to cover most of the world’s land area.
49 Population DensityPopulation density is the measure of the number per unit area.It is commonly represented as people per square mile (or square kilometer), which is derived simply by dividing...Total area population / land area in square miles (or square kilometers)
50 Population Densities North America - 32 people per square mile South America - 73 people per square mileEurope people per square mileAsia people per square mileAfrica - 65 people per square mileAustralia people per square mile
51 Arithmetic density: The total number of peoples / area of land measured in km² or mi². Physiological density: The total population / the amount of arable land.Agricultural density: The total rural population / amount of gricultural land.
52 Arithmetic Population Density Fig. 2-4: Arithmetic population density is the number of people per total land area. The highest densities are found in parts of Asia and Europe.
53 Physiological Density Fig. 2-5: Physiological density is the number of people per arable land area. This is a good measure of the relation between population and agricultural resources in a society.