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《Writing》精品PPT课件优质课下载
----Desertification
Environmental Problems
sandsorm
tsunami
twister (tornado)
Hurricane
we human beings are faced with
Environmental Problems
Dust Bowll
A Global Problem--
Desertification
Read the article and find out:
1.What are the causes of desertification?
2. What measures are taken to solve the problem?
Causes:
Bad farming methods
Several years with very little rain fall
The land dried up and wind blew the soil away
People destroy the tropical forests
Measures
Improve farming methods
Plant trees and grass
Desertification
01
Introduction