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forests
plants
people
mountains
What things are there on Earth?
There are...
..\\BBC纪录片《…》.
What can you see in this video?
What does this video talk about?
Earth
In the past
now
Is the Earth the same as before?
What are the differences?
Talk about the differences
In the past
now
In the past
now
Talk about the differences
In the past
now
Talk about the differences
1. throw rubbish everywhere
People’s bad habits
1. What cause the situation?
Discussion
2. cut down a large amount of trees
3. kill a lot of animals
4. use a lot of traffic