In this issue

Two case studies are reviewed in the light of the Zero Hunger Challenge launched in 2012 during the Rio+20 World Conference on Sustainable Development. It called, among others, for all food systems to be sustainable. The Mumbai project is expected to mitigate the challenges of hunger in a city where 41 per cent of people are forced to live in slums. The Oslo project presents a circular waste management system where the waste is used as raw materials in industry.

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