“…Human water use is sustainable for some regions at some times, but for large portions of the globe, groundwater pumping exceeds recharge, river discharge is overallocated, and water pollution (grey water use) causes rampant human disease and ecosystem degradation (Dupas, Minaudo, & Abbott, ; Falkenmark et al, ; Landrigan et al, ). Second, humans have directly modified 77% of the Earth's land surface, excluding Antarctica, through activities such as agriculture, deforestation, and wetland destruction (Watson et al, ). Land use alters evapotranspiration, groundwater recharge, and run‐off within and beyond catchments in surprising ways.…”