What Does the Image Below Represent and How Does It

What does the image below represent and how does it relate to designing sustainable cities?

A) Residents of squatter community, like this one, must be evicted in order to achieve the goal of making cities more sustainable.
B) Comparing the squatter community in the foreground to the skyscrapers in the back shows how a city can be transformed when sustainable city design is embraced as a goal for re-development.
C) Squatter communities, due to their lower resource consumption, should be left unchanged as living in such conditions is compatible with the goals of sustainable living.
D) Squatter settlements should be improved to provide basic service such as clean water to drink, sewage treatment, and garbage pickup so as to provide a better quality of life for the poorest of the poor.