Most nutrients in human excreta, if recovered, could offset substantial quantities of synthetic fertilizer use globally and advance food security goals by enhancing circular economies. This study analyses co-location of urban nutrients with nearby agricultural needs in 56 of the world’s largest cities and finds that in locations with high cropland density, nutrient-intensive crops and compact urban area, it would be possible and convenient to reuse human-derived nutrients in agriculture.
- John T. Trimmer
- Jeremy S. Guest
