Yoshihide Wada of the Earth Surface Hydrology group co-authored a commentary in Nature Geoscience, arguing that the wedge approach proposed for evaluating carbon mitigation policies is also suitable to evaluate policies to avoid future water stress.
See the commentary at: Wada, T., T. Gleeson and L. Esnault, 2014. Wedge approach to water stress. Nature Geoscience 7, 615-617.
See also the article in Space Daily!