Driving the steep road to the mountaintop Inca ruins of Machu Picchu is potentially dangerous and hiking there is difficult  Now the Peruvian government is installing a cable car that will make access much easier, and hence result in a large increase in tourism
However, since the presence of large numbers of tourists tends to accelerate the deterioration of a site, installation of the cable car is certain to result in harm to the ruins
The daily number of tourists that are expected to take the cable car to Machu Piccu is smaller than the original resident population of Incas.