Unit B: Looking at Ecosystems
Chapter 3: Protecting Ecosystems
Chapter 3 Introduction
What would you do if you were living in a cold climate and your furnace didn't work? You might put on more clothes or find another way to heat your home. Or you might just move! Living things in nature face similar problems if their environments change. In this chapter you'll find out how people help protect ecosystems from harmful changes.
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Chapter 3, Lesson 1: What Kinds of Changes Occur in Ecosystems?
Summary
Ecosystems can change slowly through the process of succession. Changes can happen slowly due to changes in climate or in communities of living things. Rapid changes can result from storms and other natural events such as fires, floods, and volcanic eruptions. Even when ecosystems are destroyed, they can recover over time. Click on the button below to watch and interact with a video. |
Chapter 3, Lesson 2: How Do People Change Ecosystems?
Summary
Ecosystems can be damaged when people use chemicals and clear land to meet human needs. People also can help repair or reclaim damaged ecosystems and help build new ones. Click on the button below to watch and interact with a video. |
Chapter 3, Lesson 3: What is Conservation?
Summary
People can conserve natural resources by reducing their use, and by recycling and reusing materials. Governments help conserve by setting up protected areas, laws, and agencies that preserve the environment. Click on the button below to watch and interact with a video. |
For Review
Click on the picture below for more about conservation.