| A | B |
|---|
| renewable resources | A resource that is naturally replaced in a relatively short time. |
| nonrenewable resources | A natural resource that is not replaced as it is used. |
| pollution | A change to the environment that has a negative effect on living things. |
| developmental viewpoint | The belief that humans should be able to freely use and benefit from all of the Earth's resources. |
| preservation viewpoint | The belief that all parts of the environment are equally important, no matter how useful they are to humans. |
| conservation viewpoint | The belief that people should use natural resources as long as they do not destroy those resources. |
| clear-cutting | The process of cutting down all of the trees in an area at once. |
| selective cutting | The process of cutting down only some trees in an area. |
| sustainable yield | A regular amount of a renewable resource that can be harvested without reducing the future supply. |
| fishery | An area with a large population of valuable ocean organisms. |
| aquaculture | The practice of raising fish and other water organisms for food. |
| biodiversity | The number of different species in an area. |
| keystone species | A species that influences the survival of many others in an ecosystem. |
| genes | Structures in an organism's cells that carries its hereditary information. |
| extinction | The disappearance of all members of a species from the Earth. |
| endangered species | A species in danger of becoming extinct in the near future. |
| threatened species | A species that could become endangered in the near future. |
| habitat destruction | The loss of a natural habitat. |
| habitat fragmentation | The breaking of a habitat into smaller, isolated pieces. |
| poaching | Illegal hunting of wildlife. |
| captive breeding | The mating of endangered animals in zoos or preserves. |
| taxol | Chemical in Pacific yew tree bark that has cancer fighting properties. |
