Some NPOs which are particularly well known, often for the charitable or social nature of their activities performed during a long period of time, include Amnesty International, Oxfam, Rotary International, Kiwanis International, Carnegie Corporation of New York, Nourishing USA, DEMIRA Deutsche Minenräumer (German Mine Clearers), FIDH International Federation for Human Rights, Goodwill Industries, United Way, ACORN (now defunct), Habitat for Humanity, Teach For America, the Red Cross and Red Crescent organizations, UNESCO, IEEE, INCOSE, World Wide Fund for Nature, Heifer International, Translators Without Borders and SOS Children's Villages. Which organization is a leader in promoting nature and preserving the enviornment?