TED Talk that connects urbanization (and the global need for housing) to climate change. Might be good to stop the video about half way through to ask students about potential problems, and then restart to hear the speaker address some of these issues.
SOUTH AFRICA may no longer have the chunkiest economy in Africa, now that Nigeria's has been revalued upwards, but it still has the fattest people. This is evidence, to many South Africans, of the good life: fast food, a fast car, an urban lifestyle.