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Pollution pole + u + shun

Pollution is when air, water, and soil become dirty. Pollution affects all parts of the environment. When we put something into the environment, it does not just go away. That pollutant becomes part of the environment. When a bad chemical enters our lakes and rivers, it does not just stay there. It enters plants and animals that live in the water. It may enter drinking water that people use. The planet Earth is the only place we know of in the whole universe where humans can live. We need to take care of it.