| Term | Definition |
| Environmental Science | the study of how humans interact with the environment. |
| Ecology | is the study of how living things interact with each other and with their non-living environment |
| Biology | the study of living organisms. |
| Earth Science | the study of the Earth's nonliving system and planet. |
| Physics | the study of matter and energy. |
| Chemistry | is the study of chemicals and their interactions. |
| Social Science | are the study of human populations. |
| Hunter-Gatherers | people who obtain food by collecting plants and by hunting animals. |
| Agriculture | is the practice of growing, breeding, and caring for plants and animals. |
| Industrial Revolution | involved a shift from animal muscle to machine power, and large scale factories. |
| Natural Resources | any natural material that is used by humans. |
| Pollution | is an undesired change in air, water, or soil that adversely affects the health, survival, or activities of humans. |
| Biodiversity | refers to the number and variety of species that live in an area. |
| Supply and Demand | the greater the demand for a limited supply the more it is worth. |
| Cost and Benefit | balances the cost of the action against the benefits on expects from it. |
| Risk Assessment | tool that helps us create cost-effective ways to protect our health and the environment. |
| Ecological Footprint | shows the productive area of Earth needed to support one person in a particular country. |
| Developed Country | high economy, low population growth, industrial economy, and strong government. |
| Developing Country | poor economy, high population growth, simple agricultural economy, and poor government. |
| Sustainability | the condition in which human needs are met in such a way that a human population can survive indefinitely. |