Tourism means travel for recreational, leisure or business purposes.The World Tourism Organization define that tourists as people who 'travel and stay in places outside their usual environment for more than twenty four hours or minimum Fourty five to seventy five days in Mountain Expedition and not more than one consecutive year for leisure, business and other purposes not related to the exercise of an activity remunerated from within the place visited'.It is big business, one of the world's largest industries and in many regions the single largest source of investment and employment.While it does not have the same 'smokestack' as the manufacturing industry, it is by no means environmentally benign, generating significant levels of pollution and consuming considerable amounts of natural resources.
