Another important thing for the 'eco-tourism' is to have as little effect on the local environment as possible. This is easy to do if you follow some common-sense advice. Don't leave litter lying around and use biodegradable products whenever possible. If resources like water or fuel are in short supply, then use as little of these as you can, and of course you should never buy products made from rare plants or endangered animals. If you are lucky enough to visit a truly exotic destination such as a coral reef, remote mountain or desert region, or a rainforest then you should try to have it exactly as you found it, so that future visitors can enjoy it just as you did.