Pollution is the presence of chemicals at high enough levels in the air, water, soil, or food to threaten the health, survival, or activities of humans or other living organisms.
Pollutants can enter the environment naturally, such as from volcanic eruptions or through human activities, such as from burning coal.
Industrialized agriculture also is a major source of air and water pollution.
Some pollutants contaminate the areas where they are produced. Others are carried by wind of flowing water to other areas.
Pollutants come from 2 types of sources.
Point sources and non-point sources.
-point sources of pollutants are single, identifiable sources.
-non-point sources of pollutants are larger, dispersed, and often difficult to identify.
Pollutants can have 3 types of unwanted effects.
1. disrupt or degrade life-support systems for humans and other species.
2. they can damage wildlife, human health, and property.
3. they can create nuisances such as noise and unpleasant smells, tastes, and sights.
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