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protect nature and environment from pollution, how to protect our environment from pollution, how to protect from pollution, ways to protect environment from pollution, protect the earth from pollution, prevent the environment from being polluted, how to prevent pollution in the environment, protect the natural environment, save nature reduce pollution, save the environment from pollution, protecting our natural environment, how to prevent from pollution, how can humans prevent pollution, how to prevent environmental pollution, prevention of environmental pollution, the prevention of pollution, how can pollution be prevented, how to prevent pollution on earth