Pollution
“Any additional to air, water, soil, or food that threatens the health, survival, or activities of humans or other living organisms.”
• Point sources
– pollutants from single identifiable sources.
– Ex. Smokestack of a power plant, exhaust pipe of a car.
• Nonpoint sources
– pollutants from dispersed (difficult to identify) source. – Ex. Pesticide spray into the air
• Unwanted effects of pollution