Recent estimates indicate that primary stocks of P will last at least a century. But the growing demand for food, the vulnerability of mineral commodities to market forces, and the geopolitical implications of reserves concentrated in places such as Morocco and China mean that “closing the loop” on our phosphorus use is critical to sustaining and securing food supplies into the next few decades.
Simplifying wastewater treatment by separating and capturing it before it enters the sewer will play an important role in making this possible. So why aren’t we all doing it already?