How does Alan Weisman most clearly use text structure to prove his point?

He describes how nature will reclaim a city over the course of many years. The World Without Us by Alan Weisman depicts what would happen to the environment if humans abruptly vanished. He describes how cities would be reclaimed by nature and how surviving lifeforms would develop. Residential neighborhoods would grow into forests within 500 years.  

-Hops

i think the correct answer would be adjustments in life roles.  this causes for one to adjust or change totally his/her career or lifestyle since the present is not beneficial to the life role he is at. for instance, you became a mother you would of course stop going to malls and enjoying life outside. you would be staying at home taking care of your child.