Q13. The 'pounding feet of the tourists' strongly juxtaposes the 'city's fragile stones', characterising the damage caused by tourists in comparison to the frailer nature of the ancient city of Machu Picchu.
Q14. The author is communicating that an organisation, WMF is trying to develop more policies and campaigns to allow tourists to practice sustainable tourism, with the preservation of sites under threat like Machu Picchu in mind.
Paragraph 29.. “I have only to take this half-dead man, throw him in the bed “
One method is that they are perceived as relatable. teens tend to be influenced by them because they see them as someone closer to them (age group, interests…)