1. Introduction Question
What is the “environment”?
Do human impact the environment or are changes in the environment natural?

2. Sect. 1 “Science and the Environment”

3. Understanding our Environment

4. Objectives
Define the environment, environmental science and compare environmental science with ecology. List the five major fields of study that contribute to environmental science. Describe the major environmental effects of hunter-gatherers, the agricultural revolution, and the Industrial Revolution. Classify environmental problems into three major categories.

5. What Is Environmental Science?
Environmental Science is the study of the air, water, and land surrounding an organism or a community, which ranges from a small area to Earth’s entire biosphere.
It includes the study of the impact of humans on the environment.

6. Major Goal To : understand and solve environmental problems.
To accomplish this goal, environmental scientists study:
1) How our actions alter our environment.
2) The use of natural resources.

8. Fields of Study in Env. Sci.
Environmental science involves many fields of study. Therefore, it is know as an advanced science. .

9. Many Fields of Study

10. Most important field Most important field of study is ecology
Which is the study of interactions of living organisms with one another and with their environment.
Ex… Asian Karp and great lakes

11. Our Effect on the Environment Over Time
Wherever humans have hunter, grown food, or settled they have changed the environment.
Hunter-Gatherers – for most of human history we have been hunter gatherers, mean we moved from place to place to find food and resources.
Associated Problems : Overhunting and overuse of resources, which leads to a decline in animals and natural resources for other organisms.

12. Prehistoric animals of North America that are now extinct http://www

13. The Agricultural Revolution- 10000-y.a https://www.youtube.com/watch?v=bhzQFIZuNFY
Agriculture is the raising of crops and livestock for food or for other products that are useful to humans.
consequences of this ?
Populations grew
Changed the food we eat
Habitats destroyed, replaced by farmland
Slash and Burn
Water Shortages

14. The Industrial Revolution https://www. youtube. com/watch
Involved a shift from energy sources such as animals and running water to fossil fuels such as coal and oil.

15. In factories, the large- scale production of goods came less expensive than the local production of handmade goods.
On the farm, machinery reduced the amount of land and human labor needed to produce food.
With fewer people producing their own food, the populations in urban areas steadily grew.

16. Consequences of the Industrial Revolution
Positive
Negative
Light Bulb
Agricultural Productivity
Sanitation (Cholera)
Nutrition
Medical Care
Transportation (motors)
Habitat Loss
Severe water and air pollution
Development of plastics
Extinction of species
Overpopulation

17. Earth a Closed System
Earth is a closed system mostly, meaning that barely anything enters or leaves the earth.
Only thing that enters and leaves earth is heat energy.

18. Population Growth Problems
Worlds population is set to double in next 50 years, fast rate of population growth ever! By 2050 the world population should reach 13 Billion Food and Resources ? ? ?

20. Population Growth

21. Good News About Population Growth
Although the worlds population is going to double to 13 Billion, after that the population will stop increasing.
More to come on population growth

22. 3 Main Categories of Environmental Problems
1) Resource Depletion
2) Pollution
3) Loss of Biodiversity