• Some conservation groups have volunteer opportunities in national parks like Yosemite.Yosemite National Park image by Bobby4237 from Fotolia.com
  
  Many conservation groups rely on volunteers to keep their operations running. Some conservation groups are organized purely through volunteer work while others recruit volunteers for special events and projects. Volunteer opportunities with conservation groups are available all over the world and can involve anything from cleaning up a local stream to traveling across the world to help care for endangered species.
  
  

Student Conservation Association

• The Student Conservation Association began placing students in volunteer positions with national parks in the 1950s. Today it places high school and college students in conservation volunteer positions across the United States with the mission of helping to create the environmental leaders of the future.
  
  

Earthwatch

• Earthwatch is a worldwide environmental organization that supports environmental research and education. Earthwatch offers internships, jobs and volunteer opportunities a well as opportunities to assist in research expeditions.
  
  

The Nature Conservancy

• The Nature Conservancy is dedicated to wildlife and land conservation around the world. It operates in all 50 states and relies on local volunteers for much of its work in the United States.
  
  

Sierra Club

• The Sierra Club is the largest and oldest grassroots environmental organization in the United States. Founded in 1892 by John Muir, the Sierra Club provides local volunteer opportunities across the U.S. as well as service trips and volunteer vacations.