1. Deforestation has made some rare species animals vanish into some danger.
2. We should walk or cycle to work to have good health and precious enviroment.

3. Mass inductrialization is considered as one of the main cause of air pollution
4. He avoids going out at rush hour at three because there is so much harmful dust and smoke emitting from vehicle
5. One of the useful and easy way to save energy is to use electric appliances economically
6. Burning fossil seems to be the basic cause of greenhouse, a big problem to our earth.