Wildlife conservation is the science of analyzing and protecting the Earth’s biological diversity, which is the variation of life forms within a given ecosystem, or for the entire Earth. Biodiversity on the Earth today consists of many millions of distinct biological species. Wildlife conservation is the process of individuals and organization to protect and preserves these species through conservation education, preservation of habitat and management of fish and wildlife. There are many wildlife conservation societies and organizations that work tirelessly to save wild lands and wildlife through international conservation and education. These groups strive to change attitudes toward nature and to protect natural areas and wild populations of plants and animals, including endangered species. They also work to promote more efficient use of the Earth’s resources and energy to reduce pollution. Environmental preservation, mainly within the United States, is the strict setting aside of natural resources to prevent damage caused by contact with humans or by human activities, such as logging, mining, hunting and fishing. This differs somewhat from conservation in that conservation allows for some degree of industrial development, within sustainable limits. In other parts of the world, preservation and conservation are often used interchangeably.