To get ideas as to what you can do to research or promote a cause, try:

Do Something.org.
Youth Activism
Youth Noise
Facing History
Human Rights Watch
Amnesty International

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To look up information about various organizations try the following sites:
MADD (Mothers Against Drunk Drivers)
CAI (Central Asia Institute) (Greg Mortenson- __Three Cups of Tea__)
Susan G. Komen - For the Cure (Breast Cancer)
Multiple Sclerosis Society
American Cancer Society
Locks of Love
National Multiple Sclerosis Society
Habitat for Humanity
Doctors Without Borders
Red Cross
Salvation Army
St. Jude Children's Research Hospital
UNICEF
International Court of Justice
European Union
Oprah's Angel Network
Michael J. Fox Foundation for Parkinson's Research
CARE
Christopher Reeve Foundation
Bill and Melinda Gates Foundation
North Shore Animal League America
World Health Organization
American Society for the Prevention of Cruelty to Animals
Natural Resources Defense Council (Environmental Action Organization)
HEIFER International :Ending Hunger, Caring for the Earth
Tiger Woods Foundation
Greenpeace Organization (Environmental Concerns)
United Nations
Elie Wiesel Foundation for Humanity
Save the Children Foundation
Food for the Poor
Amnesty International
Peace Corps