Increasing_Human_Population_F10_Lect2

Increasing_Human_Population_F10_Lect2 - Increasing Human...

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1 Increasing Human Population The Greatest Environmental Problem Fall 2010, Lecture 2
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2 US Census Bureau Population Estimate Click link below to see Latest Census Bureau Estimate of U.S. and World Populations United State Population Clock World Population Clock
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3 HUMAN POPULATION GROWTH Earth's population: 6 billion (Oct 12, 1999) Every second , five people are born and two people die, a net gain of three people. This decade +1,000,000,000 = India In one decade. approximately π x 10 7 seconds/year, x 10 years, times 3 new lives per second = 1,000,000,000 new people
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4 United Nations Population Division – 2008 Estimates Year Population Year Population 1950 2 529 723 2005 6 512 276 1955 2 763 453 2010 6 908 688 1960 3 023 358 2015 7 302 186 1965 3 331 670 2020 7 674 833 1970 3 685 777 2025 8 011 533 1975 4 061 317 2030 8 308 895 1980 4 437 609 2035 8 570 570 1985 4 846 247 2040 8 801 196 1990 5 290 452 2045 8 996 344 1995 5 713 073 2050 9 149 984 2000 6 115 367 In thousands
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5 2050 Population Estimates Year of Estimate Low variant Medium variant High variant Constant fertility variant 2002 7 408 573 8 918 724 10 633 442 12 753 513 2005 7 679 714 9 075 903 10 646 311 11 657 999 2008 7 958 779 9 149 984 10 461 086 11 030 273 In thousands
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6 Projected Population Growth
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7
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8 Thomas Malthus (1798) “An Essay on the Principle of Population” Populations grow geometrically while supporting resources grow arithmetically Population, if not purposefully checked (“preventative checks”), would outpace resources and lead to unplanned “positive checks” that would return population to sustainable levels
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9 Significant Developments and Human Population
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10 Recent Population Explosion Detailed look at the last thousand years
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11 Global Fertilizer use Crop Yield and Fertilizer Input “Green revolution”: high-yielding crop varieties chemical fertilizers pesticides irrigation mechanization
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12 Humans Have: Transformed or degraded 39-50% of the Earth's land surface • Increased atmospheric CO 2 concentration by 40% Overexploited or depleted 22% of marine fisheries 44% more are at the limit of exploitation
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New South Wales, Australia 13 Figure shows the trend in the total catch for marine fisheries in NSW since 1984–85.
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14 Changes Due to Man About 20% of bird species have become extinct in
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This note was uploaded on 05/04/2011 for the course ESC 3704 taught by Professor Staff during the Spring '08 term at FAU.

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Increasing_Human_Population_F10_Lect2 - Increasing Human...

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