Visitors go to Paris because of the greenbelt???  I thought maybe the tourists wanted to see the art and the monuments to culture?  (The Louvre, Notre Dame cathedral and most of the other buildings on "Ile de la Cite", and all the exhibits on both sides of the Seine nearby. etc.)  The art is there  mainly because, historically, the French royalty spent money on palatial decorations and monuments. Our governments spend money on social issues.       

But how does "attracting international tourists" make a city into a good place to live?   Consider the phrase:  "Nice place to visit, but I wouldn't want to live there."