Introducing Environmental Science and Sustainability 1.
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Transcript of Introducing Environmental Science and Sustainability 1.
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Introducing Environmental Science and Sustainability1
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© 2012 John Wiley & Sons, Inc. All rights reserved.
Overview of Chapter 1
Human Impacts on The Environment Population, Resources and the Environment Sustainability Environmental Science Addressing Environmental Problems
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© 2012 John Wiley & Sons, Inc. All rights reserved.
The Environment (Earth)
Life has existed on earth for 3.8 billion yrs
Earth well suited for life Water over ¾ of planet Habitable temperature,
moderate sunlight Atmosphere provides
oxygen and carbon dioxide
Soil with essential minerals for plants
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© 2012 John Wiley & Sons, Inc. All rights reserved.
Human Impacts on Environment- Population
Expected to add several billion more people in 21st century
Earth’s Human Population is at 6.9 billion Growing exponentially
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Extreme Poverty
1 in 4 people in the world live in extreme poverty
Cannot meet basic need for Food Safe drinking water Clothing Shelter Health Sanitation & Education
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Extreme poverty was defined in 1996 by Joseph Wresinski Defined as : the absence of one or more factors
enabling individuals and families to assume basic responsibilities and to enjoy fundamental rights.
The World Bank defined the new international poverty line as $1.25 a day for 2005
Extreme Poverty
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Less vs. Highly Developed
81% of the world’s population live in poor countries
Development Ranges of Countries Less developed (LDC’s – Bangladesh, Ethiopia & Laos) Moderately developed (MDC’s - Mexico, South Africa &
Thailand) Highly developed (HDC’s – Canada, Japan, USA & most
of Europe)
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Gap Between Rich and Poor
Less Developed Countries (LDC) Low level of industrialization very high fertility rate high infant mortality rate low per capita income
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Gap Between Rich and Poor
Highly Developed Countries (HDC) Complex industrialized bases low population growth high per capita incomes Ex: US, Canada, Japan
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Population/Resources&Environment
Nonrenewable resources Present in limited supplies and are depleted by use Aluminum, tin, copper, fossil fuels
Renewable resources Replaced by nature fairly rapidly and can be used
forever as long as they are not overexploited in the short term
Trees, animals, soils, fresh water
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© 2012 John Wiley & Sons, Inc. All rights reserved.
Types of Natural Resources
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Consumption
Consumption Human use of materials and energy People in HDCs are big consumers
Children born in HDC’s cause a greater impact on the environment and on resource depletion then 12 or more born in developing countries.
Unsustainable Consumption Occurs when the level of demand on a country’s
resources damages or depletes the resource enough to reduce the quality of life for future generations
Caused by overpopulation and/or overconsumption
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Ecological Footprint
The average amount of land, water and ocean required to provide that person with all the resources they consume
Earth’s Productive Land and Water 11.4 billion hectares
Amount Each Person is Allotted (divide Productive Land & Water by Human Pop.)
1.8 hectares
Current Global Ecological Footprint of each person
2.7 hectares
A Hectare = 10,000 square meters (100 m x 100 m)Primarily used in the measurement of land (A football field is 0.54 hectares)
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Ecological Footprint
Humans have an ecological overshoot
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IPAT Model
Measures 3 factors that affect environmental impact (I)
I = P A TI = P A T
Environmental Impact
Number of people
Affluence per person
Environmental effect of
technologies
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IPAT Model
P = Population The number of people
A = Affluence (wealth) represents the average consumption of each person
in the populationT = Technology
represents how resource intensive the production of affluence is; how much environmental impact is involved in creating, transporting and disposing of the goods, services and amenities used.
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Environmental Sustainability
The ability to meet current human need for natural resources without compromising the needs of future generations
Requires understanding: The effects of our actions on the
earth An understanding that earth’s
resources are not infinite
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Tragedy of the Commons (1968 Paper)
Garrett Hardin (1915–2003) an American ecologist who warned of the dangers of
overpopulation
called attention to “the damage that innocent actions by individuals can
inflict on the environment”
He is also known for Hardin's First Law of Human Ecology: "You cannot do only one thing", which expresses the
interconnectedness of every action
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Sustainable Development
Economic development that meets the needs of the present generation without compromising future generations
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Environmental Science
An interdisciplinary study of human relationship with other organisms and the earth Biology Ecology Geography Chemistry Geology
Physics Economics Sociology Demography Politics
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Earth System and Environmental Science
System A set of components that interact & function as a whole
Model Used to describe interactions of environmental systems
Global Earth Systems Climate, atmosphere, land, coastal zones, ocean
Ecosystem A natural system consisting of a community of
organisms and its physical environment
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Earth Systems and Environmental Science
Negative feedback Change triggers a
response that counteracts the changed condition
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Positive Feedback
Positive feedback Change triggers a
response that intensifies the changing condition
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Scientific Method
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Controls and Variables in Experiment
Variable A factor that influences a process The variable may be altered in an experiment to see
its effect on the outcome
Control The variable is not altered Allows for comparison between the altered variable
test and the unaltered variable test
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Five Steps to Addressing Environmental Problem
Case Study: Lake Washington
Five steps are idealistic Scientific Assessment Risk analysis Public Education & Involvement Political Action Long-term Evaluation
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Assessing Environmental ProblemCase Study: Lake Washington
Large, freshwater pond Suburban sprawl in 1940’s
10 new sewage treatment plants dumped effluent into lake
Effect = excessive cyanobacteria growth that killed off fish and aquatic life
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Scientific Assessment Aquatic wildlife assessment done in 1933 was
compared to the 1950 assessment Hypothesized treated sewage was introducing
high nutrients causing growth of cyanobacteria Risk Analysis
After analyzing many choices, chose new location (freshwater) and greater treatment for sewage to decrease nutrients in effluent
Assessing Environmental ProblemCase Study: Lake Washington
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Public Education/Involvement Educated public on why changes were necessary
Political Action Difficult to organize sewage disposal in so many
municipalities Changes were not made until 1963!
Evaluation Cyanobacteria slowly decreased until 1975
(gone)
Assessing Environmental ProblemCase Study: Lake Washington
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Results
Assessing Environmental ProblemCase Study: Lake Washington
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To discuss:
Come up with 10 reasons why Children born in HDC’s cause a greater impact on the
environment and on resource depletion then 12 or more born in developing countries.
Ted talks – Building a toaster from scratch http://www.ted.com/talks/thomas_thwaites_how_i_built_a_t
oaster_from_scratch.html