Download Intro to Environmental Science Slideshow

In every deliberation, we must consider our impact on the next seven generations.
- The Iroqouis Confederacy
 Environmental science is the study of the interaction of humans with the
natural environment.
 The environment includes all of the living and nonliving things that we
interact with.
 Climate
 Soil and landforms
 Water sources
 Other living organisms
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 Natural capital is all the natural resources and natural/ecosystem services
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that keep us and other species alive
Natural capital also supports human economies
Natural resources are materials and energy in nature that are essential or
useful to humans – you will see classifications of natural resources later in
this slideshow
Natural or ecosystem services are processes provided by healthy
ecosystems. Examples include air/water purification, topsoil renewal, and
pollination
All of these services support life and economies at no monetary cost to us!
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Solar energy
Natural Capital
Natural Capital = Natural Resources + Ecosystem Services
Air
Renewable
energy (sun,
wind, water
flows)
Air purification
Climate control
UV protection
(ozone layer)
Life
(biodiversity)
Population
control
Water
Water purification
Pest
control
Waste treatment
Nonrenewable
minerals
(iron, sand)
Soil
Soil renewal
Nonrenewable
energy
(fossil fuels)
Land
Food production
Nutrient
recycling
Natural resources
Ecosystem services
Fig. 1-3, p. 7
Natural Capital Degradation
Degradation of Normally Renewable Natural Resources
Climate
change
Air pollution
Shrinking
forests
Decreased
wildlife
habitats
Species
extinction
Soil
erosion
Water
pollution
Aquifer
depletion
Declining ocean
fisheries
Fig. 1-7, p. 11
 Environmental science and
the issues that it studies
are complex and
interdisciplinary, meaning
it incorporates concepts
and ideas from multiple
fields of study.
Principles of Environmental Science, Cunningham, 2005.
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 A community decides to use coal for
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electricity, as it is the cheapest source
available. (Economics)
The coal must be mined from under the
soil. (Geology)
The coal must be transported to the
population center by road or rail.
(Engineering)
When it is burned at a power plant, air
pollution is released. Some of that
pollution is converted to acid in the
atmosphere. (Chemistry)
This falls as acid rain somewhere
downwind. (Meteorology)
The acid stresses plants by affecting
their nutrient absorption. (Ecology)
Laws are passed requiring the plant to
install pollution scrubbers. (Politics)
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 Humans have impacted the Earth
since the very beginnings of
civilization.
 In 2400 B.C., the agricultural fields of
Sumeria had grain production similar
to modern agriculture – about 30
bushels per acre.
 The Sumerians relied on irrigation,
the artificial application of water from
another source.
 Tigris and Euphrates rivers.
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 All water contains small amounts of minerals called salt, and that salt
built up in the Mesopotamian soil over time.
 Yields declined to half, then a fourth within a few hundred years.
 By the 7th century A.D., slave labor had to be used to strip the upper salt layer
from the soil so it could still be farmed.
 By the 16th century, the Fertile Crescent of Mesopotamia was a salty wasteland.
 This is an example of two important concepts in environmental science:
 The Law of Unintended
Consequences, which states that
the actions of people and
governments always have
unexpected effects.
 Unsustainability, a condition that
cannot continue at its current rate.
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 An ecologist named Garrett Hardin wrote an essay called “The Tragedy of
the Commons”, describing a major source of environmental conflict:
resources that are not privately owned or regulated will often be depleted.
 The self-interest of individuals takes priority over the best interests of the
entire population.
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 A small village consists mostly of farmers that raise
and sell sheep at a nearby city. The only place for the
sheep to graze is a commons in the center of the
village.
 A commons is an area that belongs to no individual; it
is shared by the entire society.
 The villagers in this situation will have an incentive
to obtain and graze as many sheep as possible. Over
time, the commons will become barren and
unusable.
 A second village has its grazing land divided into
nine fenced sections, each of which is owned by a
different family.
 These families will carefully control the amount of
grazing to ensure their land is usable in the longterm.
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 Climate change, air pollution, water pollution, and overfishing of
international waters are all modern examples of the Tragedy of the
Commons.
Norilsk, Russia
Source: ecojunk.wordpress.com
Zadar, Croatia
Source: Agence France-Presse
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 In the United States, the environmental movement began with a series of
conservation measures taken by President Teddy Roosevelt.
 The goal was to prevent the destruction of commons – primarily
unsustainable logging and hunting.
 National Parks are preserved areas that are relatively unaltered from their
original state.
 No fishing, logging, commercial hunting, or livestock grazing can occur.
 National Forests are federally-managed, but do allow commercial logging
and recreational hunting and fishing.
 National Wildlife Refuges do not allow commercial activities, but may
allow recreational hunting and fishing.
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 Years after the National Parks system was established, the city of San
Francisco experienced an earthquake, followed by a massive fire.
 About 90% of the damage was due to the fire, which exposed the city’s
inadequate water supply.
"San Francisco 1906 fire 02 DA-SN-03-00958" by Harry Sterling Hooper.
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 The city applied to the federal government to construct a reservoir in the Hetch
Hetchy valley of Yosemite National Park.
 In order for the dam to be constructed, a law would have to be passed by Congress
and signed by President Woodrow Wilson.
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 The Hetch Hetchy debate led to the emergence of two major philosophies
- or environmental ethics; the moral relationship that humans have with
the environment.
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 Anthropocentrism is a human-centered
philosophy that protects and promotes
of human interests or well-being at the
expense of all other factors.
 Biggest advocate: Gifford Pinchot, the
first chief of the U.S. Forest Service.
 Ecocentrists is a nature-centered
philosophy that places intrinsic value on
ecosystems regardless of their usefulness
to humans.
 Biggest advocate: John Muir, founder of
the Sierra Club.
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 Construction of the dam began in 1914. It is still in use today.
 Gifford Pinochet summarized the conservation ethics philosophy of
planned, regulated utilization of environmental resources like this:
"Where conflicting interests must be reconciled, the question shall always be answered from the
standpoint of the greatest good of the greatest number in the long run.“
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 Conservationists during the Progressive Era were the most concerned
about resource depletion. They categorized natural resources into four
groups:
 Inexhaustible (perpetual) resources cannot be used up.
 Sunlight.
 Renewable resources can be replaced, but the process may take a long
time.
 Timber, wind.
 Nonrenewable resources cannot be replaced, as their formation took
millions of years.
 Coal, oil, natural gas.
 Recyclable resources can be used more than once.
 Iron, aluminum, copper.
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 A series of major environmental disasters through the early 20th century
raised awareness of other environmental issues besides resource
conservation.
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 A dense smog of from a zinc plant in Donora, Pennsylvania in 1948 sickened
thousands.
 This was one of the deadliest incidents of air pollution, the introduction of
particles or gases into the atmosphere that are harmful to living organisms.
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 Radioactive fallout from nuclear bomb testing in the Marshall Islands exposed
native islanders and Navy sailors to radioactive fallout.
 This material was carcinogenic, meaning it increased the risk of cancer.
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 A major oil spill near the city of Santa Barbara in 1969, coupled a fire on
the Cuyahoga river that same year left powerful images of the effects of
water pollution, the contamination of lakes, rivers, oceans, and
groundwater.
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 Rachel Carson published the book “Silent Spring” in 1962, documenting the
effects that indiscriminate spraying of pesticides like DDT were having on the
environment.
 Many of these pesticides were persistent pollutants, meaning they resist normal
environmental degradation.
 Biodegradable pollutants will decompose over time.
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 Pollution
 Pollution is a degradation or an
undesired change in air, water,
or soil that affects the health of
living things.
 Biodegradable pollution will
break down naturally over time.
 Nondegradable pollution does
not break down.
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 Pollution, whether in air or water, can move and affect
ecosystems far away from the source.
 This map shows the areas with the highest
concentrations of air pollution.
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 Many species, such as the whooping crane, nearly disappeared completely from the wild due to overhunting and
habitat loss. This raised awareness of the problem of extinction.
 Extinction, or the complete loss of a species, is a natural event that can be accelerated by human actions.
 Elevated rates of extinction reduces the biodiversity, or variety of species found in a particular habitat or
ecosystem.
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 There are five known major extinction events in
Earth’s history.
 The most recent major extinction, about 65 million
years ago, caused 75% of all species to disappear from
the Earth.
 Believed to have been caused by a meteor impact.
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 Assuming no catastrophic events occur,
extinctions normally occur at a pretty
slow rate, called the background rate.
 Normal background extinction rate for
mammals is 1 every 200 years.
 Scientists believe we may be in the midst
of the next major extinction event, due to
human influences.
 Australia has experienced 27 mammal
extinctions since 1788, primarily due to
the influence of European settlers.
The short-tailed hopping
mouse, now extinct in
Australia.
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 Rapid increases in the population size
of countries like India and China
caused fears of human overpopulation
and famine, an extreme scarcity of
food.
 One prediction from the book, The
Population Bomb:
“The battle to feed all of
humanity is over. In the 1970s
hundreds of millions of people
will starve to death in spite of any
crash programs embarked upon
now. At this late date nothing can
prevent a substantial increase in
the world death rate...”
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Exponential Growth of Human Population
Billions of people
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Industrial revolution
Black Death—the Plague
Time
Hunting and
gathering
Agricultural revolution
Industrial
revolution
Fig. 1-16, p. 17
 In 1978, homes in the city of Love Canal, New York, were abandoned due to
leakage from a massive chemical waste dump near the elementary school.
 This was hazardous waste; compounds that are especially dangerous to the
environment and human health.
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Causes of Environmental Problems
Population
growth
Unsustainable
resource use
Poverty
Excluding
environmental costs
from market prices
Increasing
isolation
from nature
Fig. 1-15, p. 16
 A series of laws were passed in response to the modern environmentalism
movement.
 The Safe Drinking Water Act, which regulates the testing and contents of
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municipal tap water.
The Clean Water Act, which restricts pollution of surface waters.
The Clean Air Act, which restricts pollution of the atmosphere.
The Resource Conservation and Recovery Act, which describes rules for
handling toxic and hazardous waste.
The Endangered Species Act, which lists
species at risk for extinction and plans
for their recovery.
The creation of the Environmental Protection
Agency (EPA), which is charged with enforcing
these and other laws.
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 Many of those same environmental issues persist today, but are
increasingly complex to deal because they are spread throughout the
entire world, not just a single country.
 Global environmentalism explores issues and problems over the entire world,
not just within the local community. Examples are:
 Global warming
 Population control
 Water scarcity
 Resource depletion
 Loss of biodiversity
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 One of the biggest challenges is dealing with environmental issues in
developing countries that have not yet fully industrialized.
 Compared to developed countries, developing countries tend to have:
 Lower gross domestic product (GDP), a measure of the monetary value of the
goods and services produced.
 Higher total fertility rates, the number of children born to an average woman.
 Lower life expectancy, the number of years an average person will live.
 Fewer environmental regulations and worker protections.
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U.S.
Japan
India
Haiti
Life Expectancy
79
83
66
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Total Fertility Rate
(births per woman)
1.93
1.39
2.56
3.35
Gross Domestic
Product Per Person
$49,040
$34,830
$4,500
$1,490
Energy Use Per Person 13,240
(Kilowatt-Hours)
7,841
698
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Carbon Dioxide
Produced Annually
Per Person (Tons)
9.3
1.7
0.2
17.0
 While developed countries have a slower population growth rate, they
have a much higher rate of consumption, the rate of use of natural
resources.
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 Economic principles has a huge influence in environmental decision-
making.
 Supply and demand predicts that the cost of a resource will increase when
demand is high or supply is low.
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 Another important economic idea is the cost-benefit analysis. This
questions whether the benefit of doing something justifies the economic
cost.
 Many companies use labor in developing countries as a way to reduce their
own costs of production and the final price tag of their products.
 The workers in these countries often face dangerous working conditions.
These are hidden costs not reflected in what we pay for the item.
A collapsed garment factory in Savar, Bangladesh. Source: AP
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 StarKist brand chunk light tuna in water
 Price at Shop Rite: $0.99
 American Tuna brand wild albacore tuna
in water
 Price at Whole Foods Market: $4.99
 What are the hidden costs behind that
$4.00 price difference?
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 Another good example is the 1984 explosion of a pesticide factory located
near the town of Bhopal, India.
 Environmental regulations, worker protections, and government inspections
were minimal.
 Chemicals that leaked into the air resulted in an immediate death toll in
the thousands.
 A total of 558,125 injuries were
reported to the Indian government.
 A settlement of $470 million was
reached by Union Carbide and the
Indian government, although
originally $3.3 billion was claimed.
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 In 2004, on the 20th anniversary of the Bhopal disaster, the Yes Men
performed an elaborate prank to increase awareness of the stillunremediated Union Carbide site.
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 The impact of a person on the environment is expressed in a model called
the ecological footprint, an estimate of the amount of land needed to
support their lifestyle.
 Includes the amount of space needed to support each person in a nation,
including forests, farms, cities, etc.
 If the developing countries industrialized and matched the resource
consumption rate of the United States, an estimated three Earths would be
needed.
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 I=PxAxT
 I = Environmental impact
 P = Population
 A = Affluence
 T = Technology
 Human Impact (I) on the environment equals the product of P= Population,
A= Affluence, T= Technology. This describes how growing population,
affluence, and technology (+ or -) contribute toward our environmental
impact.
IPAT
Less-Developed Countries
Consumption per
Technological impact
Environmental
Population (P) X person (affluence, X
per unit of
impact of
=
A)
consumption (T)
population (I)
More-Developed Countries
Fig. 1-14, p. 17
 Sustainability is when human needs are met so
that the population can survive indefinitely.
 “Meeting the needs of the
present without
compromising the ability of
future generations to meet
their own needs.”
 Brundtland Commission, 1987
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Three Principles
of Sustainability
Chemical Cycling
Solar Energy
Biodiversity
Fig. 1-3, p. 8
 Dependence on solar energy
 The sun provides warmth, fuels photosynthesis, and indirectly powers
renewable sources of energy like wind and hydro)
 Biodiversity
 A wide variety and adaptability of natural systems and species will keep
ecosystems healthy (natural services and populations remain in check)
 Chemical cycling
 From the environment to organisms and then back to the environment,
necessary for life
Principles of
Sustainability
ECONOMICS
Full-cost pricing
Fig. 1-5, p. 9
 Full-cost pricing
 Include harmful health and environmental costs of goods and services in
their market prices (gasoline should really cost about $12/gal…)
 Win-win solutions
 Solutions to env problems should benefit both people and the environment
 A responsibility to future generations. Duh.
 There are three perspectives in how we should deal with issues of
pollution, resource overconsumption, and loss of biodiversity.
 The planetary management worldview takes the perspective that humans
should manage the Earth’s resources to achieve the maximum benefit.
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 The stewardship worldview also believes that humans should manage the
Earth, but in a more ethical and sustainable way.
 Also anthropogenic, but with more of an emphasis on living such a way that
human needs can be met indefinitely. This is called sustainability.
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 The environmental wisdom worldview
believes that we are totally dependent on
nature and should preserve nature as
much as possible to maintain our own
species.
 An ecocentric worldview that emphasizes
sustainability for all species.
The Wat Pa Luang Ta Bua Temple in Thailand,
where orphan Bengal tigers and their offspring are
cared for.
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 Each of these worldviews acknowledges that
the Earth is a closed system, meaning matter
does not enter or leave it in large amounts.
 Resources are finite.
 Wastes do not “go away”.
 These understandings form the basis for
understanding and solving each of the issues
within environmental science.
Earthrise, taken by astronaut Frank
Borman in 1968, during the Apollo 8
mission.
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