近年来，城市空气污染越来越严重，各大城市相继出现了雾霾天气(hazy weather)，请根据下列内容要点提示，写一篇关于保护环境的文章。 内容要点：
Now cars are increasing very fast. Factories are continuing polluting the air. Trees are being cut down. So the hazy weather is becoming more and more serious. It’s time for us to do something to protect the environment.
First of all, we’d better not travel by car unless it’s necessary. We can take the bus or the subway, walk or ride a bike if we don’t go far away. We can also set up a volunteer club and ask more people to join it. We can plant more trees, give the government advice to stop the factories polluting the air and water.
As people are knowing more about PM2.5, they are becoming more and more concerned about their living environment. As students, what should we do?
First, we should ride bikes or take buses to school. Riding bikes is also good for our health. We should try our best to advise our parents to drive less. Try to walk or ride bikes to work. Second, we’d better use both sides of the paper. Don’t waste paper. Third, we should save power. Remember to turn off the lights when we leave the classroom. At last, we should plant more trees and flowers.
If everyone makes a little effort, the world will be more and more beautiful.
Haze is air pollution in which is mixed up with dust, smoke and other dry particles ,and it obscure the clarity of the sky and interacts with the natural environment.