definition: "Any practice which reduces the amount of any hazardous substance, pollutant, or contaminant entering any waste stream or otherwise released into the environment (including fugitive emissions) prior to recycling, treatment, or disposal."

Pollution Prevention Act of 1990

Pollution includes many things:

• Overconsumption of resources
• Solid wastes
• Liquid wastes
• Air emissions
• Wastewater discharges
• Spills and leaks