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3. They go to work by taxi. They don't save a lot of money.
They won't 
4. People build too many houses. Land for farming decreases.
Land for farming
5. The Earth becomes hotter. The polar ice cap melts.
If 
6. You don't write on both sides. You waste your paper.
You
7. We use recycled products. We won't harm the environment.
We
8. People breathe polluted air. They suffer from lung diseases.
If
9. The residents don't often cycle. There is too much air pollution in this area.
There
10. Those companies will receive good feedbacks. They produce reusable bags.
If