Download - A.P. Environmental Science Introduction
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A.P. Environmental Science Introduction
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Global Environmental Science Picture
Four global trends
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Four Global Trends
Population growth and increasing consumption
Degradation of soils Global atmospheric changes Loss of biodiversity
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1. Population growth
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1. Population growth
reached 6 billion about October 12, 1999
Will reach 7 billion October, 2011 May reach 10 billion by 2050 World POPClock Population Connection
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Fig. 1-1, p. 6
IndustrialRevolution
?
Agricultural revolutionHunting andGathering
Billio
ns o
f peo
ple
Time
Black Death—the Plague
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Fig. 1-12, p. 18
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1. Population growth
The United States reached 300 million on October 17, 2006 at 3:46 AM.
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http://www.census.gov/population/www/popclockus.html
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California now has 38 million, may have 50 million by 2025
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Population Growth All people create demands
on the earth Demand tends to increase
with affluence “affluenza”
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Question
“ How can Earth support a near doubling of the population and still increase standards of living”
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2. Degradation of Soils
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2. Degradation of Soils
Fertile soil is the foundation for plant growth and food production
BUT-- soils are being degraded by erosion , overgrazing, development
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3. Global Atmospheric Changes
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3. Global Atmospheric Changes
Burning fossil fuels ( oil, natural gas , and coal) has caused increases in global carbon dioxide
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CO2 blocks infrared radiation and therefore traps heat in the atmospheric
resulting in displacement of plants, rise in sea level, changes in climate and weather
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4. Loss of Biodiversity
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4. Loss of BiodiversityIncreasing population and increasing consumption are accelerating conversion of forests, grasslands, and wetlands, etc. to agriculture and urban development
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Destruction of habitat
= destruction of species
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Biodiversity is important Mainstay of crops and medicine
development Critical factor in maintaining
stability of natural systems For aesthetic and moral reasons
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Unifying Themes of Environmental Science
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3 Unifying Themes
Sustainability Stewardship Sound science
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Sustainability Means that a system or process can be
continued indefinitely without depleting resources to keep it going
Harvests cannot exceed reproduction rates
Lead to concept of sustainable development
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Stewardship
Stewards are responsible for earth and its population
Concept originated from environmentalism movement
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Sound Science Environmental issues are
sometimes embroiled in controversy
One side is science One side are those who
mistrust scientists and their interpretations and motives
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Understanding science People need to understand how
science is done Will lead to greater
understanding of the issues Sound science is essential to
helping guide us into the 21st century