Here are some thought provoking images from Kibera
This is the practice of urban agriculture in the slums of Kibera. How often do we see similar garbage dumps in slums of India, yet there is still no drive to push for urban agriculture in our country. The world has taken up to the concept of urban agriculture, slums of Africa are taking it as an economic and environmental opportunity, Cuba transformed its whole debt struck economic situation with the practise of urban agriculture. India has many lessons to learn.
Read more about the Kibera example at : http://www.afrigadget.com/2008/09/04/innovations-in-a-slum-kibera-case-study/