World Changing Article , No Impact Man Commentary on Travel, Ecotourism.org, UNEP on the effects of tourism.
I've been a tourist, and I know the effect it has upon me as an individual. It is an amazing opportunity to see how other people live, and how different life can be. I also don't know what effect I've had on them though. Should I have been more careful how I spent my money? On a more definitive measuring scale, there is the carbon footprint of flying half way across the world. So much to consider.
And why do most Ecotourism ads look towards traveling in jungles and safaris?