introduction to ap environmental...
TRANSCRIPT
Introduction to AP
Environmental
Science
Focusing on Chapter 1 in Miller
textbook
Environment :All the things around us with which we interact:
• Living things
• Animals, plants, forests, fungi, etc.
• Nonliving things
• Continents, oceans, clouds, soil, rocks
• Our built environment
• Buildings, human-created living centers
• Social relationships and institutions
Includes the relationships between these components of the environment
What is Environmental Science?
Definition of environmental science:
the interdisciplinary study of
(1) how the earth works,
(2) how we interact with the earth, and
(3) how to deal with environmental
problems
Let’s break that down…
Definition of Environmental Science
Environmental Science is a broad, interdisciplinaryfield
ES includes many fields of study, including the natural sciences and the social sciences
Definition of Environmental Science
ES studies how the earth works
What are the four “spheres” of our planet?
• atmosphere
• biosphere
• lithosphere
• hydrosphere
These are interconnected
and influence each other
Definition of Environmental Science
ES studies how humans impact the earthHow do we upset the natural balance?
• We use resources (consumption)
• We produce waste
Notice how our economic
systems of production and
consumption depend on natural
resources (input) and produce
waste, pollution and ecosystem
damage (output)
Definition of Environmental ScienceES studies how to deal with man-made environmental
problems
To reduce or eliminate our unbalancing effect we can use:
• Decision making models
• Problem solving skills
The Earth is constantly changing -- and always has
There have been major changes in earth – ice ages come and go, volcanic eruptions change the climate, development of life on earth changed the atmosphere, etc.
Humans haven’t
been around that
long relative to
earth age and
even life on earth
But Humans profoundly affect the environmentHistory of human impact –
• humans have been affecting the planet since their beginning
• even early humans with limited weapons may have contributed to the extinction of some of the large mammals, such as the woolly mammoth
Agricultural Revolution
Gradual move from nomadic lifestyle of hunter-gatherers to the farming of domesticated animals and plants
Started about 10,000 years ago
How did this impact the environment? Brainstorm then discuss
What does this quote mean? Read and then discuss
“The history of life on earth has been a history of interaction between living things and their surroundings. To a large extent, the physical form and the habits of the earth's vegetation and its animal life have been molded by the environment. Considering the whole span of earthly time, the opposite effect, in which life actually modifies its surroundings, has been relatively slight. Only within the moment of time represented by the present century has one species—man—acquired significant power to alter the nature of his world.”
Rachel Carson, Silent Spring
Industrial Revolution
Development of machines to do manual/animal labor has led to big impacts on the earth
Late 1700s- early 1800sWhat are some of these impacts?
Impacts of Industrial Revolution
Positive:
Get more work done, get it done faster and easier
Negative:
Requires burning fossil fuels → air pollution
Extracting fossil fuels from the earth is damaging
Allows very rapid destruction of habitat by machines
(Ex: logging)
Pennsylvania, 1948Virginia coal mining, present day
The Human Population Over Time:Locate agricultural and industrial revolutions….
1880
1930
1960
1974
1987
1999
2015*
Yr. each billion was reached
* projected
Scale of Environmental Problems
Environmental problems are
typically categorized by the
affected population.
•Global problems, like global
warming and the hole in the
ozone layer affect the entire
world population.
•Local problems, such as
deforestation or pollution, can
occur on a local scale
“Anthropocene”Some scientists have suggested that the man-made changes
to the earth have led us into a new geologic time period
called the Anthropocene (anthro- means “human” and
cene- means “new”)
This has not been formally accepted by geologists but is
being used more and more in scientific literature related to
environmental science
What Keeps Us Alive?
➢ Solar energy – all life and economies
depend on energy provided by the sun
➢ Natural capital – the earth’s resources and
ecological services
So what resources are we using?
RESOURCES
Air
Water Energy
Soil Minerals
NATURAL CAPITAL
Climate
Control
Waste
Treatment
Pest &
Disease
Control
Population
Control
Pollution
Control
BiodiversityNutrient
Recycling
SERVICES
Aka “ecosystem or natural
services”
Aka “natural resources”
Note two categories:
resources (matter and energy)
services (processes) -
also called ecological or
ecosystem services
⬜ Renewable resources:◼ Perpetually available: sunlight, wind, wave energy◼ Renew themselves over short periods: timber, water, soil
▫ These can be destroyed⬜ Nonrenewable resources: fixed quantity; renewable only by
geological processes that take millions of year◼ Oil, coal, minerals
Natural resources = substances and energy sources needed for
survival
Sustainable Yield – the highest rate at which a
renewable resource can be used indefinitely without
reducing its available supply
Environmental Degradation – occurs
when the use of resources exceeds the rate
of replacement
The rate at which we use
resources is important
Notice the erosion resulting from
extensive deforestation in
Madagascar
Energy Resources – coal, oil, natural gas
Metallic Resources –copper, iron, nickel,
aluminum
Non-Metallic
Resources-salt, clay, sand,
phosphates
Economic DepletionWhen the cost of extracting and using what is left exceed its
economic value
Important to reuse and recycle these resources
Nonrenewable resources cannot be
regenerated
Ecosystem services: natural processes that
support life on earth and provide a benefit
to humans in our quality of life and in our
economic systems
http://www.youtube.com/watch?v=N2whW
WYSh6M&feature=related
We not only depend on nature’s
physical resources but also its
processes
Estimates of various Ecosystem Services
ECOSYSTEM SERVICES VALUE (trillion $US)
Soil formation 17.1
Recreation 3.0
Nutrient cycling 2.3
Water regulation and supply 2.3
Climate regulation (temperature and
precipitation)
1.8
Habitat 1.4
Flood and storm protection 1.1
Food and raw materials production 0.8
Genetic resources 0.8
Atmospheric gas balance 0.7
Pollination 0.4
All other services 1.6
Total value of ecosystem
services
33.3
Source: Adapted from R. Costanza et al., "The Value of the World’s Ecosystem Services
and Natural Capital," Nature, Vol. 387 (1997), p. 256, Table 2.
Ecological footprint - the environmental impact of a person or population
Amount of biologically productive land + water for raw materials and to dispose/recycle waste
Overshoot: humans have surpassed the Earth’s capacity
• Affluenza: an unsustainable lifestyle that results in
overconsumption and materialism
• Often associated with stress, anxiety, lack of satisfaction with
life, overwork, feeling that one never has enough stuff
• Already prevalent in developed countries, but is also
spreading to the rest of the developing world
Globalization: the process of social, economic and environmental global changes that lead to an increasingly interconnected world
Has led to the democratization of learning and communication
How does globalization lead to a bigger human
impact?
Could it reduce our environmental impact?
Essay written by Garrett Hardin in 1969
Main idea: When people have free access
to unregulated use of shared resources,
they tend to overuse them, even deplete
them, in order to further their own self-
interest
Example from Hardin: People who share a
grazing field will put more and more of
their cattle on it; each additional cow
benefits the person, but the damage is
shared by everyone
Real-life example: open ocean fish stocks
have declined dramatically in many areas
“Spaceship Earth”Earth - a closed system,
meaning materials do not enter or leave, only energy does
Damage that occurs stays in the system
A tragic metaphor for “Spaceship Earth” ?
Easter Island is a relatively small, isolated Pacific island on which there are hundreds of large stone sculptures, indicating that a complex society once lived there
Reference on Easter Island, Collapse: How Societies Choose to Fail or
Succeed, by Jared Diamond
A tragic metaphor for “Spaceship Earth” ?When European explorers
arrived in the 1700’s they found a mostly barren landscape, with no trees over 10 feet tall, yet there were hundreds of toppled statues all over the island.
The few people living on the island had no horses or oxen, were using grass to build fires and lived a primitive lifestyle.
The mystery: How did the Easter Islanders build and erect the statues, why did they do it and what happened to the civilization that accomplished this?
A tragic metaphor for “Spaceship Earth” ?
Evidence has been pieced together to provide the following explanation:
The island was settled by Polynesians from other islands around 400 CE.
At that time there were trees, including palms, on the island as shown by pollen studies. There is evidence that land and sea birds were abundant.
The human population grew as high as 30,000 as the islanders harvested dolphins and fish for food using wooden canoes. They also ate native island birds and rats. Farms were started to provide more food.
A tragic metaphor for “Spaceship Earth” ?
Like other Polynesian cultures, society was divided into chiefs and commoners, which were established into clans.
On Easter Island, there was collaboration between the clans, but also competition that resulted in building the large stone heads using rock from an island quarry and moving them into place on their territory. One theory is that this process required many workers to move them by pulling them along wooden tracks, possibly on a wooden sled. All of this required a huge expenditure of resources to support the structures and feeding the workers.
http://www.bing.com/videos/search?q=easter+island&view=detail&mid=1040FBF74FAFE3D5A6581040FBF74FAFE3D5A658&first=0
A tragic metaphor for “Spaceship Earth” ?Eventually, the island was completely deforested, leading
to local extinction of many species on which the islanders depended, as well as the loss of the raw materials to sustain their standard of living. Deforestation also led to soil erosion and a decrease in crop yield from farms. Climate change may have contributed to deforestation.
A tragic metaphor for “Spaceship Earth” ?By 1680, civil war replaced the organized clans. People
survived as best they could, raising more domesticated chickens for food. The statues that had once been erected as a sign of superiority between clans were then toppled over by rival clans, and remained as evidence of the societal collapse when the Europeans arrived.
A tragic metaphor for “Spaceship Earth” ?
Is this a small scale model of what could happen to our planet?
Similarities: overexploitation of resources in a fragile, closed system, with no where to escape, no place to get more resources
The Good News
Jared Diamond writes in Collapse,“While we do face big risks, the most serious
ones are not ones beyond our control, …. Because we are the cause of our environmental problems, we are the ones in control of them, and we can choose or not choose to stop causing them and start solving them.”
What can we do differently?
SustainabilityDefinition: "development that meets the
needs of the present without compromising the ability of further generations to meet their own needs."Bruntland Commission, 1987
Think of it as “Living within an ecological budget”
What is the difference between living off the capital and living off the
income provided by this capital?
Example: $1 million dollar lottery – How could you live off of it without
depleting the original $1 million?
Relate this back to natural capital….
Why is this so important???
Have you heard of some of these sustainable practices?
Economic development –
improvement of living standards by
economic growth, measured by per
capita GDP
per capita GDP – the GDP divided by
the total population
Economic Growth – increase in the capacity of a country to provide people with goods and services, measured by increase in GDP
Gross Domestic Product (GDP)the annual market value of all goods and services produced by all firms and organizations, foreign and domestic, operating within a country (increase in GDP indicates economic growth)
Sustainability is tied to economies
Two categories:
Developed countries
Developing countries
Can you give characteristics and examples of
each?
Characteristic Developed countries Developing countries
Affluence More wealth More poverty
Per capita GDP High Low
Population growth Slow or none High
Education High levels Low levels
Industrialization High Low
Consumption of world’s
resources
High Low
Production of world’s
waste
High Low
Examples U.S., Japan, western
European countries
Most of Africa, parts of
India and China, much of
Latin America
Percent of
World’s:
Developing
countries
Developed
countries
Population
Population
growth
Wealth and
income
Resource
use
Pollution
and waste
19
81
0.1
1.6
85
15
88
12
75
25
Fig. 1-13 p. 15
Triple Bottom Line of Sustainability -
Three P’s have to be included:
Achieving true sustainability will require
business, government, citizens, nations,
engineers, inventors, etc. working together
➢ Current Emphasis: Reactive
➢ Sustainability Emphasis: Proactive
Current
Emphasis
Sustainabilit
y
EmphasisPollution cleanup
Waste disposal
(bury or burn)
Protecting species
Environmental
degradation
Increased resource
use
Population growth
Depleting and
degrading natural
capital)
Pollution prevention
(cleaner production)
Waste prevention
& reduction
Protecting where
species live
(habitat protection)
Environmental
restoration
Less wasteful
(more efficient)
resource use
Population stabilization by
decreasing birth rates
Protecting natural capital
and living off the biological
interest it provides
Increase in awareness and action toward sustainability is
happening, so that some people think we are in a “Sustainability
Revolution” leading to another phase of human history. What do
you think???
Summary
What’s the situation?
• We depend completely on the environment for survival
• We are experiencing increased wealth, health, mobility, leisure time
• Humans change the environment, often in ways not fully understood – unintended consequences
• Natural systems have been degraded i.e., pollution, erosion and species extinction
• Environmental changes threaten long-term health and survival
BUT...Awareness and action toward sustainability is increasing. We will learn more details about this as the year goes on.