In most parts of the world，many students help schools make less （pollute）.They join environment clubs.In environment clubs，people work together to make the environment clean.
Here are some things students often do.
No﹣garbage lunches.How many lunch bags do you throw away after lunch？Environment clubs ask students to bring （they） lunches in bags.Then the bags are used again and again.Every week they will choose the class that makes the （little） garbage and report it to the whole school.
No﹣car days.Cars also pollute the environment，so on a no﹣car day，nobody comes to school in a car，including the students and the teachers.
Turn off the water.A leaky toilet can waste twenty to forty liters of water in hour.In a year，that would fill a large swimming pool.In environment clubs，students mend those broken toilets.
As a result，our environment will be （clean） than before.
