This U.S. industry comprises establishments primarily engaged in promoting the preservation and protection of the environment and wildlife. Establishments in this industry address issues, such as clean air and water; global warming; conserving and developing natural resources, including land, plant, water, and energy resources; and protecting and preserving wildlife and endangered species. These organizations may solicit contributions and offer memberships to support these causes. Illustrative Examples: Animal rights organizations Natural resource preservation organizations Conservation advocacy organizations Wildlife preservation organizations Humane societies without animal shelters Cross-References.