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coal
oil
Most of （大多数）our energy
comes from coal and oil.
Solar energy（太阳能）
Wind energy（风能）
Water energy（水能）
Nuclear energy（核能）
How do we protect the Earth?
Protect the Earth
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Unit7
保护地球
2. What's the matter with the Earth?
The Earth is ill.
Watch and answer
Save water
Save energy
Save trees
Don’t use too much plastic
节约
Watch and answer
How do we protect the Earth?
Let's learn
What do we use water to do?
We drink water and use water to clean things everyday.
Water is useful.
useful
有用的