1. Environmental Problems, Their Causes, and Sustainability
Chapter 1

2. Three Big Ideas Rely more on renewable energy from the sun.
Protect biodiversity by preventing the degradation of the earth’s species, ecosystems, and natural processes, and by restoring areas we have degraded.
Help sustain earth’s natural chemical cycles by reducing waste and pollution, not overloading natural systems with chemicals, and don’t remove natural chemicals faster than the cycles can replace them.

3. WHAT ARE THREE PRINCIPLES OF SUSTAINABILITY?
Section 1-1
WHAT ARE THREE PRINCIPLES OF SUSTAINABILITY?

4. Environmental science is a study of connections in nature
Environment includes all living and nonliving things with which an organism interacts.
Environmental science studies how the earth works, our interaction with the earth, and ways to deal with environment problems and live more sustainably.
Ecology studies relationships between living organisms, and their interaction with the environment.
Environmentalism is a social movement dedicated to protecting life support systems for all species.

5. Nature’s survival strategies follow three principles of sustainability
Life depends on solar energy.
Biodiversity provides natural services.
Chemical/nutrient cycling means that there is little waste in nature.

6. Three principles of sustainability

7. Sustainability has certain key components
Life depends on natural capital, natural resources and natural services.
Many human activities can degrade natural capital.
Solutions are being found and implemented.
Sustainability begins at personal and local levels.

8. Key natural resources and services

9. Nutrient cycling

10. Some resources are renewable and some are not
Humans depend on resources to meet our needs.
A perpetual resource is continuously renewed and expected to last (e.g. solar energy).
A renewable resource is replenished in days to several hundred years through natural processes.
Sustainable yield is the highest rate at which a renewable and non-renewable resource can be used indefinitely without reducing its available supply.

11. Some resources are renewable and some are not
Some resources are not renewable.
Nonrenewable resources exist in fixed quantities.
Exhaustible energy (e.g. coal and oil).
Metallic minerals (e.g. copper and aluminum).
Nonmetallic minerals (e.g. salt and sand).
Sustainable solutions: Reduce, reuse, recycle.

12. Rich and poor countries have different environmental impacts
Developed countries include the high income ones
e.g. United States, Canada.
Developing countries include the low income ones
e.g. China, India.

13. HOW ARE OUR ECOLOGICAL FOOTPRINTS AFFECTING THE EARTH?
Section 1-2
HOW ARE OUR ECOLOGICAL FOOTPRINTS AFFECTING THE EARTH?

14. We are living unsustainably
Environmental, or natural capital, degradation is occurring.
We have solutions to these problems that can be implemented.

15. Degradation of normally renewable natural resources

16. Pollution comes from a number of sources
Point sources are single, identifiable sources (e.g., smokestack).
Nonpoint sources are dispersed and often difficult to identify (e.g., lawn runoff).
We can clean up pollution or prevent it.
Pollution cleanup is usually more expensive and less effective.
Pollution prevention reduces or eliminates the production of pollutants.

17. The tragedy of the commons: overexploiting shared renewable resources
In 1968, the biologist Garrett Hardin called the degradation of openly shared resources the tragedy of the commons.
Reducing degradation.
Reduce use by government regulations.
Shift to private ownership.

18. Ecological footprints: our environmental impacts
Ecological footprint is the amount of biologically productive land and water needed to supply a person or country with renewable resources and to recycle the waste and pollution produced by such resource use.
Per capita ecological footprint is the average ecological footprint of an individual in a given country or area.

19. Ecological footprints: our environmental impacts
Ecological deficit means the ecological footprint is larger than the biological capacity to replenish resources and absorb wastes and pollution.
Humanity is living unsustainably.
Footprints can also be expressed as number of Earths it would take to support consumption.

20. Total and per capita ecological footprint of selected countries

21. IPAT is another environmental impact model
In the early 1970s, scientists Paul Ehrlich and John Holdren developed the IPAT model.
I (environmental impact) =
P (population size) x
A (affluence/person) x
T (technology’s beneficial and harmful effects).

22. I = P x A x T

23. WHY DO WE HAVE ENVIRONMENTAL PROBLEMS?
Section 1-3
WHY DO WE HAVE ENVIRONMENTAL PROBLEMS?

24. Experts have identified four basic causes of environmental problems
Population growth.
Unsustainable resource use.
Poverty.
Excluding environmental costs from market prices.

25. Causes of Environmental Problems
Population growth
Unsustainable resource use
Poverty
Excluding environmental costs from market prices
Figure 1.10: Environmental and social scientists have identified four basic causes of the environmental problems we face (Concept 1-3). Question: For each of these causes, what are two environmental problems that result?
Fig. 1-10, p. 16

26. The human population is growing exponentially at a rapid rate
Human population is increasing at a fixed percentage so that we are experiencing doubling of larger and larger populations.
Human population in 2009 was about 6.8 billion.
Based on the current increase rate there will be 9.6 billion people by 2050.
We can slow population growth.

27. Exponential growth

28. Affluence has harmful and beneficial environmental effects
Wealth results in high levels of consumption and waste of resources.
Average American consumes 30 times as much as the average consumer in India.
“Shop-until-you-drop” affluent consumers are afflicted with a disorder called affluenza.
Affluence has provided better education, scientific research, and technological solutions, which result in improvements in environmental quality (e.g., safe drinking water).

29. Poverty has harmful environmental and health effects
Poverty occurs when the basic needs for adequate food, water, shelter, health, and education are not met.
One in every five people live in extreme poverty (<$1.25/day), and more are susceptible.

30. Poverty has harmful environmental and health effects
Poverty causes harmful environmental and health effects.
Environmental degradation caused by need for short-term survival.
Malnutrition.
Inadequate sanitation and lack of clean drinking water.
Severe respiratory disease.
High rates of premature death for children under the age of 5 years.

31. Harmful effects of poverty

32. Malnutrition

33. Prices of goods and services due not include harmful environmental and health costs
A company’s goal is often to maximize the profit.
Often consumers do not know the damage caused by their consumption.
Government subsidies may increase environmental degradation.
There are ways to include harmful costs of goods and services.
Shift from environmentally harmful to beneficial government subsidies.
Tax pollution and waste heavily while reducing taxes on income and wealth.

34. People have different views about environmental problems and their solutions
Each individual has their own environmental worldview—a set of assumptions and values reflecting how you think the world works and what your role should be.
Environmental ethics are beliefs about what is right and wrong with how we treat the environment.
Planetary management worldview holds that we are separate from and in charge of nature.

35. People have different views about environmental problems and their solutions
Stewardship worldview holds that we can and should manage the earth for our benefit, but that we have an ethical responsibility to be caring and responsible managers.
Environmental wisdom worldview holds that we are part of, and dependent on, nature and that nature exists for all species, not just for us.

36. WHAT IS AN ENVIRONMENTALLY SUSTAINABLE SOCIETY?
Section 1-4
WHAT IS AN ENVIRONMENTALLY SUSTAINABLE SOCIETY?

37. What is an environmentally sustainable society?
Environmentally sustainable societies protect natural capital and live off its income.
Increase reliance on renewable resources.
Protect earth’s natural capital.
We can work together to solve environmental problems.
Trade-off solutions provide a balance between the benefits and the costs.
Individuals matter especially in success of bottom-up grassroots action.