1. Introduction to Environmental Science

2. Introduction What is Environmental Science? What is an environment?
Environment: all the external conditions, both abiotic and biotic, that affect an organism or group of organisms.
Organisms also exert effects on their environment

3. Introduction
Environmental Science: the interdisciplinary study of how humanity interacts with other organisms and the nonliving physical environment
What is the focus of environmental science?
To identify, understand, and solve problems that society has generated.

4. Environmental Science is Interdisciplinary
Environmental Science includes:
Demography
Biology
Cultural anthropology
Chemistry
Natural resources management
Geology
Physics
Agriculture
Earth science
Engineering
Ecology
Law
Geography
Politics
Economics
ethics
Sociology

5. Environmental Problems are complex and seldom have simple solutions.

6. Environmental Problems are complex and seldom have simple solutions.
A significant portion of photochemical smog in New Jersey is derived from pollutants emitted by coal-burning power plants in the Midwest.
Air pollution generated in China affects air quality in the western parts of the US and Canada
Oxides of sulfur and nitrogen emitted by coal-burning power plants in the Midwest contribute to acid rain problems in Canada
Air pollution in developing nations is partially the result of the combination of low wages in poor countries and strict environmental laws in affluent countries.

7. Sustainability Earth has limited resources to support human societies.
Objectives:
Explain what is meant by sustainability and sustainable development
Explain how population growth is related to sustainable development
Earth has limited resources to support human societies.

8. Sustainability
There are numerous examples of civilizations which did not live within the constraints of their environment.
Mayans
Incas
Romans
Easter Island

9. Easter Island Settled around 400-800 A.D.
Ample forests were systematically cut for agriculture land, structural materials, and to move large stone monuments
Deforestation led to soil erosion.
Soil erosion led to water quality degradation and elimination of fish and shellfish populations
Eroded soil did not support agriculture
Population went from ~8000 in the 1600’s to several hundred in the 1800’s.

10. Effect of Population Growth

11. Effect of Population Growth
Each person creates a certain demand on the Earth’s resources.
Population growth AND increasing consumption per person can stress Earth’s resources
Examples of unsustainable practices have led to:
Groundwater supplied being depleted
Agricultural soils being degraded
Oceans being overfished
Oil reserves being depleted
Forests cut faster than they can grow.

12. Sustainability A sustainable process or system…
…can continue indefinitely without depleting any of the material or energy required to keep it going.
This was first applied to activities such as forestry and fisheries
Can also be applied to freshwater supplies, agricultural soils, and the ability of natural systems to absorb pollutants

13. Sustainability
Historically, sustainability/pollution concerns have been a local problem.
We are now faced with global sustainability issues such as:
Acid rain
Ozone depletion
Global climate change

14. Sustainable Society
A sustainable society is in balance with the natural world, continuing generation after generation, neither depleting its resource base by exceeding sustainable yields nor producing pollutants in excess of nature’s ability to absorb them.
Primative societies- usually sustainable (high mortality rates)
Modern societies-many interactions with enviroment are NOT sustainable

15. Sustainable Development
Development – defined as continued improvement of living standards
Sustainable development
Development that meets the needs of the present without compromising the ability of future generations to meet their own needs.