waste - useless materials, pollute - to make air, water and soil too dirty and dangerous for people, nature - the world with all living things, the land and the seas, environment - the place in which people live and work, healthy - good and useful for your health, power station - a large building with machines that give electricity, ecologist - a scientist who studies the environment and the way plants, animals and people live together in relation to each other, dump - a place usually outside a town where people collect waste,

Environmental problems

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