Glossary (from Grafton [13]):

**Water Scarcity**: A measure of water use to water availability. A commonly used measure is the ratio of the annual water extracted in a given location to the annual renewable fresh water available.

**Water Security**: According to the United Nations it is 'The capacity of a population to safeguard sustainable access to adequate quantities of acceptable quality water for sustaining livelihoods, human well-being, and socio-economic development, for ensuring protection against water-borne pollution, and water-related disasters, and for preserving ecosystems in a climate of peace and political stability.'

**Water Stress**: A measure of per capita annual renewable fresh water availability. Water availability of less than 1000 m<sup>3</sup> is considered to be high water stress and less than 500 m<sup>3</sup> is defined as extreme water stress.

**Author Contributions:** Authorship is alphabetical after the first author. Conceptualization (R.Q.G.); Applications (R.Q.G., D.G., A.M. and T.N.D.); Writing-Review & Editing (R.Q.G., D.G., A.M. and T.N.D.).

**Funding:** D.G. received partial funding from Social Sciences and Humanities Council of Canada. Grant Number: 430–2014-00785. A.M. received partial supported by the Australian Centre for International Agricultural Research under project number FSC2013-006.

**Acknowledgments:** The authors are most grateful to Arjen Hoekstra for the invitation to submit an article to the special 10th anniversary issue of Water.

**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
