In search of a solution, we understood scale was required, and quickly. The problem is far greater than we had ever imagined: in our portable sanitation infrastructure, 32 billion gallons of water is being wasted, and over 6 billion gallons of human waste is being unsustainably treated.
We also learned that our waste carries the nutrients needed to grow food — nitrogen, phosphorus, and potassium — and that if we can keep pee and poo separate, we can transform our waste into fertilizer.