The water-food-energy nexus is a large and complex challenge, but what if the interconnectivity of these three important parameters could be contained and demonstrated in one system?  The Green Loo[p] concept addresses pollution from open defecation in an ecologically sustainable system that is energy self-sufficient, reduces water demand with rainwater harvesting and wastewater reuse, and allows for local food production while reducing the urban heat island effect and increasing urban green space.