Fast - food outlets “have become ubiquitous in many cities ​ — a rising middle class is doing less physical exercise, driving more, and spending more time motionless in front of televisions, computers and video games. ”
सीबीसी न्यूज़ का कहना है कि “दो सालों के दरमियान, दुनिया की आधी आबादी शहरों में रहने लगेगी । ”