 80 and 120 billion US dollars worth of plastics are lost just by value of material every single year. If you start to think of cities as being a connected area, if you think about the fact that materials and people and biological materials are aggregated in cities, you start to see them as an opportunity and potential. If you could recover human waste, farming waste, agricultural waste, food production waste and feed that back into the biosphere, if you could turn that into energy and fertilizer and get back to the farms, you could reconnect a system which generates fertilizer and energy. It's a real source for that value and it is entirely possible today.