Pollution is contamination by a chemical or other agent that renders part of the environment unfit for intended or desired use. These uses also and very importantly include all wildlife and ecological requirements to sustain life in all its natural forms.
Pollution damages the Earth's land, water and air. It results in contamination of the earth's environment with materials that interfere with human health, the quality of life, and the natural functioning of ecosystems (living organisms and their physical surroundings).
Pollution is usually caused by human actions, but can also be the consequence of natural disasters. Pollution can also occur from disruption or damage to wastewater collection and treatment infrastructure due to severe natural events like hurricanes or flooding. Most types of pollution affect the immediate area surrounding the source, and reduce as you move away from the source.
Pollution is often caused by the garbage that people throw on the ground or into oceans, lakes or rivers.
Source: http://ezinearticles.com/?What-is-Pollution?&id=776711
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