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Air pollution is the condition in which air is contaminated by foreign substances, or the substances themselves. It consists of gaseous, liquid, or solid substances that, when present in sufficient concentration, for a sufficient time, and under certain conditions, tend to interfere with human comfort, health or welfare, and cause environmental __________.

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__________ is the process of polluting water, air, or land, especially with poisonous chemicals; poisonous or dirty substances that are polluting the water, air, or land somewhere.

Natural environment is __________, weather, and natural resources that affect human survival and economic activity.

Environmental factors are any identifiable ____________ in the physical, cultural, demographic, economic, political, regulatory, or technological environment that affects the survival, operations, and growth of an organization or person.

List 4 greenhouse gases: _________, _, _, and _______________.