chapter 1 environmental problems, their causes, and sustainability
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CHAPTER 1 Environmental Problems, Their Causes, and Sustainability. Core Case Study: A Vision of a More Sustainable World in 2060. A transition in human attitudes toward the environment, and a shift in behavior, can lead to a much better future for the planet in 2060 - PowerPoint PPT PresentationTRANSCRIPT
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LIVING IN THE ENVIRONMENT 17THMILLER/SPOOLMAN
CHAPTER 1
Environmental Problems, Their Causes, and Sustainability
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Core Case Study: A Vision of a More Sustainable World in 2060
• A transition in human attitudes toward the environment, and a shift in behavior, can lead to a much better future for the planet in 2060
• Sustainability: the capacity of the earth’s natural systems and human cultural systems to survive, flourish, and adapt into the very long-term future
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Fig. 1-1a, p. 5
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1-1 What Are Three Principles of Sustainability?
• Concept 1-1A Nature has sustained itself for billions of years by using solar energy, biodiversity, and nutrient cycling.
• Concept 1-1B Our lives and economies depend on energy from the sun and on natural resources and natural services (natural capital) provided by the earth.
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Environmental Science Is a Study of Connections in Nature (1)
• Environment:• Everything around us• “The environment is everything that isn’t me.“
• Environmental science: interdisciplinary science connecting information and ideas from• Natural sciences: ecology, biology, geology,
chemistry…• Social sciences: geography, politics, economics• Humanities: ethics, philosophy
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Environmental Science Is a Study of Connections in Nature (2)
• How nature works
• How the environment affects us
• How we affect the environment
• How to deal with environmental problems
• How to live more sustainably
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Nature’s Survival Strategies Follow Three Principles of Sustainability
1. Reliance on solar energy• The sun provides warmth and fuels photosynthesis
2. Biodiversity• Astounding variety and adaptability of natural
systems and species
3. Chemical cycling• Circulation of chemicals from the environment to
organisms and then back to the environment• Also called nutrient cycling
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From Simple Cell to Homo Sapiens
Fig. 1-2, p. 7
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Fig. 1-2, p. 7
First simple cells appear (about 3.5 billion years ago)
First multicellular life appears (about 1 billion years ago)
First major land plants appear (about 475 million years ago)
Dinosaurs disappear (about 65 million years ago)
Homo sapiens arrives (about 200,000 years ago)
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Three Principles of Sustainability
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Solar Energy
Chemical Cycling Biodiversity Fig. 1-3, p. 8
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Sustainability Has Certain Key Components
• Natural capital: supported by solar capital• Natural resources: useful materials and energy in nature• Natural services: important nature processes such as renewal of
air, water, and soil
• Humans degrade natural capital
• Scientific solutions needed for environmental sustainability
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Natural Capital = Natural Resources + Natural Services
Fig. 1-4, p. 9
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Natural CapitalSolar
energy
Air
Air purification
Climate control
UV protection (ozone layer) Life
(biodiversity)
Water Population control
Pest controlWaste treatment
Nonrenewable minerals
(iron, sand)
Soil Land
Soil renewal Food productionNatural gas Nutrient
recycling
Nonrenewable energy
(fossil fuels)
Coal seam
Natural resources
Natural services
Oil
Natural Capital = Natural Resources + Natural Services
Renewable energy (sun, wind, water
flows)
Water purification
Fig. 1-4, p. 9
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Nutrient Cycling
Fig. 1-5, p. 10
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Fig. 1-5, p. 10
Organic matter in animals
Dead organic matter
Organic matter in plants
Decomposition
Inorganic matter in soil
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Natural Capital Degradation
Fig. 1-6, p. 10
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Some Sources Are Renewable and Some Are Not (1)
• Resource• Anything we obtain from the environment to meet
our needs• Some directly available for use: sunlight• Some not directly available for use: petroleum
• Perpetual resource• Solar energy
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Some Sources Are Renewable and Some Are Not (2)
• Renewable resource• Several days to several hundred years to renew• E.g., forests, grasslands, fresh air, fertile soil
• Sustainable yield• Highest rate at which we can use a renewable
resource without reducing available supply
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Some Sources Are Renewable and Some Are Not (3)
• Nonrenewable resources • Energy resources• Metallic mineral resources• Nonmetallic mineral resources
• Reuse
• Recycle
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Reuse
Fig. 1-7, p. 11
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Recycle
Fig. 1-8, p. 12
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Countries Differ in Levels of Unsustainability (1)
• Economic growth: increase in output of a nation’s goods and services
• Gross domestic product (GDP): annual market value of all goods and services produced by all businesses, foreign and domestic, operating within a country
• Per capita GDP: one measure of economic development
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Countries Differ in Levels of Unsustainability (2)
• Economic development: using economic growth to raise living standards
• More-developed countries: North America, Australia, New Zealand, Japan, most of Europe
• Less-developed countries: most countries in Africa, Asia, Latin America
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Countries by Gross National Income per Capita
Supplement 8, Fig 2
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1-2 How Are Our Ecological Footprints Affecting the Earth?
• Concept 1-2 As our ecological footprints grow, we are depleting and degrading more of the earth’s natural capital.
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We Are Living Unsustainably
• Environmental degradation: wasting, depleting, and degrading the earth’s natural capital• Happening at an accelerating rate• Also called natural capital degradation
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Natural Capital Degradation
Fig. 1-9, p. 13
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Fig. 1-9, p. 13
Natural Capital Degradation
Degradation of Normally Renewable Natural Resources
Climate change
Shrinking forests
Air pollutionDecreased wildlife habitats
Species extinctionSoil erosion
Water pollution
Declining ocean fisheriesAquifer
depletion
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Pollution Comes from a Number of Sources (1)
• Sources of pollution• Point sources
• E.g., smokestack• Nonpoint sources
• E.g., pesticides blown into the air
• Main type of pollutants• Biodegradable• Nondegradable
• Unwanted effects of pollution
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Pollution Comes from a Number of Sources (2)
• Pollution cleanup (output pollution control)
• Pollution prevention (input pollution control)
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Point-Source Air Pollution
Fig. 1-10, p. 14
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Nonpoint Source Water Pollution
Fig. 1-11, p. 14
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Overexploiting Shared Renewable Resources: Tragedy of the Commons• Three types of property or resource rights• Private property• Common property• Open access renewable resources
• Tragedy of the commons• Common property and open-access renewable
resources degraded from overuse• Solutions
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Ecological Footprints: A Model of Unsustainable Use of Resources
• Ecological footprint: the amount of biologically productive land and water needed to provide the people in a region with indefinite supply of renewable resources, and to absorb and recycle wastes and pollution
• Per capita ecological footprint
• Unsustainable: footprint is larger than biological capacity for replenishment
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Patterns of Natural Resource Consumption
Fig. 1-12a, p. 15
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Patterns of Natural Resource Consumption
Fig. 1-12b, p. 15
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Natural Capital Use and Degradation
Fig. 1-13, p. 16
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Total Ecological Footprint (million hectares) and Share of Global Biological Capacity (%)
Per Capita Ecological Footprint (hectares per person)
United States 2,810 (25%) United States 9.7
European Union 2,160 (19%) European Union 4.7
China 2,050 (18%) China 1.6
India 780 (7%) India 0.8
Japan 540 (5%) Japan 4.8
2.5Unsustainable living
2.0
1.5Projected footprint
1.0
Nu
mb
er o
f E
arth
s
0.5
Ecological footprint Sustainable living
1961 1970 1980 1990 2000 2010 2020 2030 2040 2050
Year
0
Fig. 1-13, p. 16
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Stepped Art
Fig. 1-13, p. 16
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Global Human Footprint Map
Supplement 8, Fig 7
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IPAT is Another Environmental Impact Model
I = P x A x T
• I = Environmental impact• P = Population• A = Affluence• T = Technology
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IPAT Illustrated
Fig. 1-14, p. 17
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Fig. 1-14, p. 17
Less-Developed Countries
Consumption per person
(affluence, A)Population (P)
Technological impact per unit of consumption (T)
Environmental impact of
population (I)
More-Developed Countries
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Case Study: China’s New Affluent Consumers
• Leading consumer of various foods and goods• Wheat, rice, and meat• Coal, fertilizers, steel, and cement
• Second largest consumer of oil• Two-thirds of the most polluted cities are in China• Projections for next decade• Largest consumer and producer of cars
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Natural Systems Have Tipping Points• Ecological tipping point: an often irreversible shift in
the behavior of a natural system• Environmental degradation has time delays between
our actions now and the deleterious effects later• Long-term climate change• Over-fishing• Species extinction
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Tipping Point
Fig. 1-15, p. 19
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Fig. 1-15, p. 19
Tipping point
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Cultural Changes Have Increased Our Ecological Footprints
• 12,000 years ago: hunters and gatherers
• Three major cultural events• Agricultural revolution• Industrial-medical revolution• Information-globalization revolution
• Current need for a sustainability revolution
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Technology Increases Population
Fig. 1-16, p. 19
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Information-globalization revolution
Hu
man
po
pu
lati
on
Industrial-medical revolutionAgricultural revolution
12,500 yrs ago 275 yrs ago 50 yrs ago Present
Time (not to scale)
Fig. 1-16, p. 19
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1-3 Why Do We Have Environmental Problems?
• Concept 1-3 Major causes of environmental problems are population growth, wasteful and unsustainable resource use, poverty, and exclusion of environmental costs of resource use from the market prices of goods and services.
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Experts Have Identified Four Basic Causes of Environmental Problems
1. Population growth
2. Wasteful and unsustainable resource use
3. Poverty
4. Failure to include the harmful environmental costs of goods and services in market prices
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Causes of Environmental Problems
Fig. 1-17, p. 20
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Fig. 1-17, p. 20
Causes of Environmental Problems
Population growth
Unsustainable resource use
Poverty Excluding environmental costs from market prices
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Stepped Art
Causes of Environmental Problems
Excludingenvironmental costs from market prices
PovertyUnsustainableresource use
Populationgrowth
Fig. 1-17, p. 20
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Exponential Growth of Human Population
Fig. 1-18, p. 21
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Fig. 1-18, p. 21
?
Industrial revolution
Black Death—the Plague
2–5 million years
4000
B. C. A. D.
8000 6000 2000 2000 2100
Hunting and gathering
Agricultural revolution Industrial revolution
Time
Billio
ns o
f peo
ple
0
13
1211
10
9
8
7
6
5
4
3
2
1
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Affluence Has Harmful and Beneficial Environmental Effects
• Harmful environmental impact due to• High levels of consumption• High levels of pollution• Unnecessary waste of resources
• Affluence can provide funding for developing technologies to reduce
• Pollution• Environmental degradation• Resource waste
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Poverty Has Harmful Environmental and Health Effects
• Population growth affected
• Malnutrition
• Premature death
• Limited access to adequate sanitation facilities and clean water
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Extreme Poverty
Fig. 1-19, p. 22
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Harmful Effects of Poverty
Fig. 1-20, p. 22
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Fig. 1-20, p. 22
Lack of access to
Number of people (% of world's population)
Adequate sanitation facilities
2.6 billion (38%)
Enough fuel for heating and cooking 2 billion (29%)
Electricity 2 billion (29%)
Clean drinking water
1.1 billion (16%)
Adequate health care
1.1 billion (16%)
Adequate housing
Enough food for good health 1 billion (15%)
1 billion (15%)
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Effects of Malnutrition
Fig. 1-21, p. 23
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Prices Do Not Include the Value of Natural Capital
• Companies do not pay the environmental cost of resource use
• Goods and services do not include the harmful environmental costs
• Companies receive tax breaks and subsidies
• Economy may be stimulated but there may be a degradation of natural capital
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Environmentally Unfriendly Hummer
Fig. 1-22, p. 24
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Different Views about Environmental Problems and Their Solutions
• Environmental ethics: what is right and wrong with how we treat the environment
• Planetary management worldview• We are separate from and in charge of nature
• Stewardship worldview• Manage earth for our benefit with ethical responsibility to be
stewards• Environmental wisdom worldview
• We are part of nature and must engage in sustainable use
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1-4 What Is an Environmentally Sustainable Society?
• Concept 1-4 Living sustainably means living off the earth’s natural income without depleting or degrading the natural capital that supplies it.
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Environmentally Sustainable Societies Protect Natural Capital and Live Off Its Income
• Environmentally sustainable society: meets current needs while ensuring that needs of future generations will be met
• Live on natural income of natural capital without diminishing the natural capital
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We Can Work Together to Solve Environmental Problems
• Social capital• Encourages
• Openness and communication• Cooperation• Hope
• Discourages• Close-mindedness• Polarization• Confrontation and fear
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Case Study: The Environmental Transformation of Chattanooga, TN
• Environmental success story: example of building their social capital
• 1960: most polluted city in the U.S.
• 1984: Vision 2000
• 1995: most goals met
• 1993: Revision 2000
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Chattanooga, Tennessee
I
Fig. 1-23, p. 26
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Individuals Matter
• 5–10% of the population can bring about major social change
• We have only 50-100 years to make the change to sustainability before it’s too late
• Rely on renewable energy• Protect biodiversity• Reduce waste and pollution
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Wind Power
Fig. 1-24, p. 27
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Planting a Tree
Fig. 1-25, p. 27
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Three Big Ideas
• 1. We could rely more on renewable energy from the sun, including indirect forms of solar energy such as wind and flowing water, to meet most of our heating and electricity needs.
• 2. We can protect biodiversity by preventing the degradation of the earth’s species, ecosystems, and natural processes, and by restoring areas we have degraded.
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Three Big Ideas
3. We can help to sustain the earth’s natural chemical cycles by reducing our production of wastes and pollution, not overloading natural systems with harmful chemicals, and not removing natural chemicals faster than those chemical cycles can replace them.