Saarbruecken, Germany — Urine and ash are two prominent waste materials produced globally and in considerable amounts each year. Both contain substances that are so far de facto lost or may even pose a threat to the environment. Urine from industrial-scale farming, for instance, is responsible for significant pollution of soil and groundwater with nitrogen and phosphorous, yet N and P are also high-demand substances in agriculture and industry. Similarly, ash is rich in several metal ions, but is still usually disposed of in a landfill. Using a sequence of simple yet effective biological and chemical processes, it may be possible to convert these two unwanted materials into “green” ammonia and calcium phosphate, both valuable high-demand substances with numerous applications… Eventually, and after considering some of the logistics of the process … this “urinash process” may be upscaled to effectively reduce waste by turning it into renewed value…