What do you think is the biggest challenge facing cities in the world today? why?

Prejudice is one of the biggest challenges the world faces. Everyone displays prejudice, just not all on the same level. Some people might have small tinges of thoughts that can hint at prejudice. For example: a woman locked her car door when a group of male teens dressed in clothes which mimics that of hoodlum attire. Was she locking her door for safety? If so, do you think she had a preconceived opinion against the boys just because of how they were dressed? This example is just one of the minor levels of prejudice. The circumstances get worse from there. There is also racial prejudice and sexual prejudice. Those two are the biggest two. There are many situations in the world that pertain to racial prejudice, especially in America. Sexual prejudice is one that many individuals have issues overcoming today. For instance, the the Religious community was outraged when it became legal for the LGBT community to marry. There was a case a while back in which a christian bake shop refused to bake a cake for lesbian couple. That is one example of prejudice.