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选择性必修二《Unit 5 A delicate world》Period 1 Starting out and understanding ideas优秀ppt课件
Unit 5 A delicate world
Period 1 Staring out & Undertanding ideas
Starting out
extensive deforestation
lead to......
1. serious soil erosion;
2. desertification;
3. shorage of freshwater;
4. Severe drought
......
1. What is happening to the area?
The water area is shrinking.
2. What would a later satellite image show?
The water area will be smaller.
3. What do you think caused these changes?
Maybe it's due to over exploitation; or human over exploitation.
1. Are humans part of Earth's ecosytems? Why?
2. In what ways can humans affect ecosytems?
Reference:
A. Man is a part of nature. Human activities have become an influence on the stability of the natural environment of all spheres on earth.