In "La Mandria" park a tourist natural selection, a zoning is noticed: 80% are those who remain within a kilometre from the car, play football, have a barbecue, blast their radios; 15% get rid of the car in favour of their bicycles and happily ride around with their family looking for uncontaminated spaces, but not too uncontaminated; 5%: are environment activists, fond of the under-bush, they join guided tours around the park penetrating in easily accessible areas. But what would happen if all the tourists belonged to 5%? Could "La Mandria" manage such a heavy flux?
