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There's plenty of evidence that some forms of tourism abroad can ruin the local  landscape and ecology of once-beautiful and healthy places eg swimming pools and water-using golf courses in areas that are short of water for agricultural and domestic use.  So use guidelines and advice by companies like Tourism Concern, so that your holiday involves minimum harm to the communities in the geographical  area you are going to, and remember, flying is not environmentally friendly, especially short-hauls!