Question

How could concentrating human populations in cities help to conserve agricultural and recreational lands

Answer 1

The concentration of many people into the small area, for example, A city lowers the overall footprint of the population in the region.

 Any pollution which results from people in a city can be isolated and treated more easily even than when people are being dispersed widely.
 Many cities outlined suburbs to have a lower concentration of people because it can complicate public transport and provision of services.