Global warming

1. I have learned about earth warming.
2. It is caused by smoke and the chopping down of trees.
3. Trees clean the air.
4. Cars, electricity and fires make the air dirty.
5. Dirty air makes a blanket around the earth.
6. The sun makes the earth warm.
7. The blanket keeps the earth warm.
8. The earth cannot cool down and it gets hotter and hotter.
9. The ice in the North and South Poles melt and the sea gets fuller.
10. Cities at the coast will be under water. Animals and plants will die.

We must switch off the lights. On Saturday all the world must switch off their lights from 20:30 for an hour.