Big Volcano Ecotourism Resource Center
http://www.bigvolcano.com.au
Center for Ecotourism and Sustainable Development (CESD)
http://www.ecotourismcesd.org/
Earth Watch Institute
http://www.earthwatch.org/
Ecotourism Australia
http://www.ecotourism.org.au/
"Green" Hotels Association
http://www.greenhotels.com/
International Finance Corporation
http://www.ifc.org/
INDECON
http://www.indecon.or.id/
Inter-American Development Bank - IDBAmerica Magazine
http://www.iadb.org/
National Geographic Traveler’s Center for Sustainable Destinations
http://www.nationalgeographic.com/travel/sustainable/
National Geographic Traveler’s Destination Score Card
http://www.nationalgeographic.com/traveler/scorecard/
Pacific Asia Travel Association (PATA)
http://www.pata.org/
Planeta.com - Eco Travels in Latin America
http://www.planeta.com/
Rainforest Alliance, Sustainable Tourism Program
http://www.rainforest-alliance.org/tourism
RARE Center for Tropical Conservation
http://www.rareconservation.org/
SEEP Network
http://www.seepnetwork.org/
Sustainable Tourism CRC
http://www.crctourism.com.au/
The Edge of Africa
http://www.carltonward.com/africa/theedgeofafrica.htm
The George Washington University - International Institute of Tourism Studies
http://www.gwutourism.org/
The International Ecotourism Society (TIES)
http://www.ecotourism.org/
TIES Traveler’s Choice
http://www.ecotourism.org/
Tikal Connection
http://tikalcnx.com/
The Nature Conservancy (TNC)
http://www.nature.org
Tour Operators Initiative
http://www.toinitiative.org/
United Nations Environmental Program
Division of Technology, Industry and Economics
http://www.unep.fr/scp/tourism/
USAID Sustainable Tourism Projects Database
http://www.nric.net/tourism/database.htm
Visit Madagascar
http://www.visitmadagascar.com/
Wildlife Conservation Society (WCS)
http://www.wcs.org/
World Tourism Directory
http://www.worldtourismdirectory.com/
World Tourism Organization (UNWTO)
http://www.unwto.org/
World Wildlife Fund (WWF)
http://www.wwf.org/
World Travel and Tourism Council (WTTC)
http://www.wttc.org/
Yahoo! Ecotourism Directory
http://dir.yahoo.com/Recreation/Travel/Ecotourism/