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bad - When you throw away a newspaper or a magazine, you are throwing away some part of a tree.
Nuclear power stations can go wrong and cause nuclear pollution.
Some sprays can do a lot of harm to the atmosphere.
Acid rains are dangerous for the atmosphere.
good-If you try not to waste water, you save water and energy.
Using filters at electric power stations makes air cleaner.
Using filters in cars and buses makes air cleaner.
If you travel by bus instead of a car, you save more energy.