Sandra Postel is the author of four books on fresh water – its amazing properties, global distribution patterns, human uses, ecological values, and water management practices. Her first, the Last Oasis: Facing Water Scarcity (1992), was followed by Pillar of Sand: Can the Irrigation Miracle Last? (1999), Rivers for Life: Managing Water for People and Nature (with Brian Richter, 2003) and now Replenish: The Virtuous Cycle of Water and Prosperity (2017). She has also published numerous papers on these themes, modestly listing eight titles in the Replenish reference list, all with intriguing titles and powerful messages.