1, If you walk to school , you will reduce the air pollution.
2, If you use recycled paper, you will save a lot of trees.
3, If the earth becomes hotter , a lot of animals will die.
4, If parents teach their children about the three Rs , their children will be aware of protecting the environment.
5, if you want to save a lot of electricity, you should turn off the all the electrical appliances before going out.
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