Have you ever heard about green tourism?

Is the phrase "sustainable tourism" familiar to you? Have you ever gone on that type of holidays? If you work in the tourism industry, Have you ever offered it? Have a look at the following sites and reply to this post describing the start-up of a company which offers green tourism.

http://www.sustainabletourism.net/

http://www.gdrc.org/uem/eco-tour/eco-tour.html

http://www.fathom.com/course/21701788/session1.html

http://www.crctourism.com.au/

http://www.eos-std.com/

http://en.wikipedia.org/wiki/Sustainable_tourism

http://en.wikipedia.org/wiki/Ecotourism

After looking at all these websites and watching the video, Would you say that "green, sustainable and eco- tourism" mean exactly the same?