Before revision: Definitions 300px|Global physical and economic water scarcityWater scarcity has been defined as the "volumetric abundance, or lack thereof, of freshwater resources" and it is thought to be "human-driven".The CEO Water Mandate (2014) Driving Harmonization of Water-Related Terminology, Discussion Paper September 2014.
After revision: Definitions 300px|Global physical and economic water scarcityWater scarcity has been defined as the "volumetric abundance, or lack of freshwater resources" and it is thought to be "human-driven".The CEO Water Mandate (2014) Driving Harmonization of Water-Related Terminology, Discussion Paper September 2014.