We must do to protect the environment: plant trees, reuse water , turn off the lights when we are not using them, recycle plastic, glass and metal, use solar and wind energy , use public transportation, We mustn't do to protect the environment: cut down trees, waste too much water, turn on the lights when we are not using them, throw away plastic, glass and metal , use coal, natural gas, and petrol for energy, use our own cars,

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