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pollution

(Science: ecology) The changing of a natural environment, either by natural or artificial means, so that the environment becomes harmful to the living things normally found in it.

most often this refers to the input of toxic chemicals into the environment. Undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities.The state of being polluted.The act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors.The contamination of an environment by introducing chemicals / pollutants which have a detrimental effect on the environment and subsequently the organisms which live in it.