What are the disadvantages of tourist?

Disadvantages of the tourist industry are: tourists cause damage with footpath erosion; most of the money goes to the tour operators rather than the country for example, Gambia, most of the money made goes to different companies like the Swiss hotels and the swedish coaches; tourists cause pollution with their cars; people have problems with tourist for example, farmers don't like tourists because the tourists often trespass on their ground and ruin the crops. sorry for lack of information iv'e got the whole of my science unit to do