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acid rain	rain that contains acid from pollution.
clean	pure; free from pollution. [1/6 definitions]
conservation	the protection of natural resources, such as soil, water, or forests, from loss, pollution, or waste. [1/2 definitions]
green	of an institution or business, conserving as much energy as possible and contributing little to environmental pollution. [2/11 definitions]
smog	a mixture of smoke and fog that is caused by moist air and human pollution.

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