1. Global Institute for Water Security and School of Environment and Sustainability; University of Saskatchewan; Saskatoon SK S7N 3H5 Canada
2. School of Geosciences; University of Aberdeen; Aberdeen Scotland United Kingdom
3. US Geological Survey; Reston VA 20192 USA
4. Visiting Senior Research Fellow, King's College London; London WC2R 2LS United Kingdom
5. Department of Geography; Hong Kong Baptist University; Hong Kong