Finished:

1.We ride bicycles to go to school instead of riding motorcycle.

2.We use air-conditioner less time and we open refrigerator seldom.

3.We burn nothing harmful to the health.

4.We take the train for a long distance.

Unfinished:

1.No places to plant trees. 

1. Take public transportation or car pool for long distances

2. Plant trees or green plants.

3. Have a bike and ride it.

4. Reduce the use of refrigerants and air-conditioners.

5. Aviod burnning things such as batteries that will do us harm.