We can avoid the traffic jams and reduce the air pollution by riding bikes or walking. We mustn't throw rubbish carelessly. In this way, we can keep our city clean and tidy so that we can live a comfortable life, And we'd better plant more trees to protect the environment and make our city beautiful.
In my daily life, I can pick up rubbish and put it into the dustbin wherever I go. I can also save the energy by turning off the lights when leaving the room.
In a word, everyone can play a part in building a green city.
