Although there is no physical short-term scarcity of phosphorus, its resource efficiency should be improved

The German government has adopted a law that requires sewage plants to go beyond the recovery of phosphorus from wastewater and to promote recycling. We argue that there is no physical global short- or mid-term phosphorus scarcity. However, we also argue that there are legitimate reasons for policies such as those of Germany, including: precaution as a way to ensure future generations' long-term supply security, promotion of technologies for closed-loop economics in a promising stage of technology development, and decrease in the current supply risk with a new resource pool.