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It is commonly thought that old groundwater cannot be pumped sustainably, and that recently recharged groundwater is inherently sustainable. We argue that both old and young groundwaters can
be used in physically sustainable or unsustainable ways.
This research was supported by a Global Water Futures grant to G.F. and J.C.M. and an NSERC Discovery Grant to G.F. J.C.M acknowledges funding received as a Fellow of the CIFAR Earth4D
Subsurface Science and Exploration Program. M.O.C. acknowledges support under an Independent Research Fellowship from the UK Natural Environment Research Council (NERC; NE/P017819/1). This
commentary benefitted from discussions with P. Döll, J. Famiglietti, G. Fogg, X. Huggins, A. Manning, K. Markovich and M. Rohde.
Civil, Geological and Environmental Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA
School of Earth and Ocean Sciences & Water Research Institute, Cardiff University, Cardiff, UK
Connected Waters Initiative Research Centre, University of New South Wales, Sydney, New South Wales, Australia
Department of Geosciences, University of Arkansas, Fayetteville, AR, USA
Department of Civil Engineering, University of Victoria, Victoria, British Columbia, Canada
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
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