general science. population thomas malthus linearversusexponential
TRANSCRIPT
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General Science
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POPULATION
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Thomas Malthus
Linear versusExponential
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Population Numbers 1800
United States Population: 5,308,483
World Population: ~1,000,000,000
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Where are We Today?
United States Population: 307,339,534
World Population: 6,781,576,663
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World Vital Events 2007
Time Natural
Increase
Year 77,257,452
Month 6,438,121
Day 214,604
Hour 8,942
Minute 149
Second 2.5
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Life Expectancy has changed over the years
Years USA Botswana
1970-1975 70.8 56.1
1975-1980 73.7 60.0
1980-1985 74.7 62.8
1985-1990 75.4 64.8
1990-1995 75.8 65.0
1995-2000
2000-2005
77.2
77.5
56.3
39.7
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Life Expectancy at birth (2000-2005) source UN Statistics Division
Country Male Female Infant MR
U.S.A. 74.3 79.9 7
China 68.9 73.3 37
Japan 77.9 85.1 3
Zimbabwe 33.7 32.6 58
Sierra Leone 33.1 35.5 177
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CLIMATE CHANGE
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Natural Greenhouse Effect
Greenhouse effect Greenhouse gases
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Source: Arctic Climate Impact Assessment 2004
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Projected Surface Annual Air Temperature Changes 1990 - 2090
0C
+12C
+6C
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Greenland Ice Sheet Melt
1992 2002
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Projected Sea Level Rise
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Projected Sea Ice Extent
2010 - 2030 2040 - 2060 2070 - 2090
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Meeting the Climate Challenge January 2005Climate change represents one of the most serious and
far-reaching challenges facing humankind in the
twenty-first Century. The international consensus of
scientific opinion, led by the Intergovernmental Panel on
Climate Change, is agreed that global temperature is
increasing and that the main cause is the accumulation
of carbon dioxide and other greenhouse gases in the
atmosphere as a result of human activities. Scientific
opinion is also agreed that the threat posed will become
more severe over coming decades.
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IPCC AR4 Synthesis Report 11/2007
Warming of the climate system is unequivocal, as is now evident from observations of increases in global
average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level
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IPCC AR4 Synthesis Report 11/2007 North America • Warming in western mountains is projected to cause
decreased snowpack, more winter flooding, and reduced summer flows, exacerbating competition for over-allocated water resources;
• In the early decades of the century, moderate climate change is projected to increase aggregate yields of rain-fed agriculture by 5-20%, but with important variability among regions. Major challenges are projected for crops that are near the warm end of their suitable range or which depend on highly utilized water resources;
• During the course of this century, cities that currently experience heatwaves are expected to be further challenged by an increased number, intensity and duration of heatwaves during the course of the century, with potential for adverse health impacts;
• Coastal communities and habitats will be increasingly stressed by climate change impacts interacting with development and pollution.
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CO2 Emissions 2006
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Sea Ice sets New Record 9/16/07
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OCEAN WORLDFish Catch
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Biomass 1900 (tons/sq. km)
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and in 2000
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Reconciling Fisheries with Conservation:the Challenge of Managing Aquatic EcosystemsbyDaniel PaulySea Around UsFisheries Centre,University of British Columbia,VancouverFourth World Fisheries Congress,Vancouver, May 2-6, 2004
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Net losses: Industrialized fishing hits fish stocks
Analysis of data from five ocean basins reveals a dramatic decline in numbers of large predatory fish (tuna, blue marlins, swordfish and others) since the advent of industrialized fishing. The world's oceans have lost over 90% of large predatory fish, with potentially severe consequences for the ecosystem. These findings provide indirect support for goals established at the UN's World Summit on Sustainable Development in Johannesburg last year. UN officials argued that three-quarters of the world's fisheries were fished to their sustainable limits or beyond, and made proposals for the restoration of depleted fisheries by 2015. Data on predatory fish are important as they are not dependent on datasets from commercial fisheries, which can be unreliable.