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A Coptic Christian community has had the job of recycling much of Cairo's garbage, feeding organic waste to its pigs and salvaging every conceivable reusable product. Their livelihood is threatened by private industry.

Waste collection in Cairo. Changes being introduced by the government threaten to destroy the livelihood of the Zabaleen people.

The Zabaleen and their recycling industry under threat by government programs. Balanced view of their life style and place in society.

A brief profile of Dharavi, one of the largest informal settlements in the world, situated in the city of Mumbai, India. Concerns shared by residents about proposed government development. 

Green roofs sprouting across Mexican capital not only purify the air but aid recovery of hospital patients, says environment chief. Note podcast: The global battle for clean air. 

Explains how water is transported from long distances to supply a megacity, Beijing, and how this impacts on the people and environment outside of the city. Includes some measures taken to make the solution a sustainable one.