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- A change in the physical, chemical, or biological characteristics of the air, water, or soil that can affect the health, survival, or activities of humans in an unwanted way. Some expand the term to include harmful effects on all forms of life.
EPA - Cite This Source - This Definition
- Aerosol, Anthropogenic, carbon dioxide, Desertification, Enhanced Greenhouse Effect, Mauna Loa, methane (CH\<sub\>4\</sub\>), Source, Sulfate Aerosols, Sulfur dioxide (SO\<sub\>2\</sub\>)