1. Understanding Our Environment Section 1.1 Objectives: 1.Identify the influence of human population, technology, and cultural and industrial changes on the environment.

2. Define Environmental Science How do you think environmental problems are identified? How long ago do you think environmental “problems” started? Rachel Carson’s Silent Spring New York City and Manhattan The Fall of Troy Large mammal extinction

3. Our Environment Through Time Hunter- Gatherers The Agricultural Revolution The Industrial Revolution Characteristics Effects on the Environment

4. Hunter-Gatherers Obtain food by ______________. Small groups migrated from place to place, following game and crops. Still exist in New Guinea and Amazon rain forests of South America How do they affect the environment? 1.Spread plants 2.Animal extinction 3.Destruction of land (i.e., burning prairies)

5. The Agricultural Revolution Collect seeds of plants gathered and domesticate animals. More people in smaller areas. What effects would this have? 1.Slash-and-burn to convert land to farmland. 2.What happens when forests are cleared like this?

6. The Industrial Revolution Mid-1700’s Energy use shifted from animal muscle and water power to fossil fuels to power machines. Even more people in smaller areas. Effects? (Think both positive and negative.) “Population Growth” – p.13

7. Our Main Environmental Problems 1.Pollution –Biodegradable –Nondegradable 2.Resource depletion –Natural resource Renewable resources - examples Non-renewable resources - examples 3.Loss of biodiversity