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Pollution is defined as "The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects."Simply put there was a problem situation caused by the introduction of materials to the environment and a name for it was created.

Pollution can be created naturally (volcanos, erosion, dissolving of poisonous materials from rocks) or by human activities (industrial effluents, raw sewage discharges, carbon dioxide emissions)

At one time in Earth's history oxygen was a pollutant which wiped out the anaerobic life forms. This the "badness" of pollution is dependant on the situation.

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7y ago

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