Climate & Environment
Virtual Water
Definition
Virtual water is the volume of water consumed to produce a good or service, "embedded" in it through trade — coined by Tony Allan (1993, Stockholm Water Prize 2008) to explain how Middle Eastern economies survive water scarcity by importing grain rather than growing it. Virtual water flows are vast: agricultural trade moves thousands of cubic kilometres of embedded water annually, meaning importing regions' water footprints fall heavily on distant basins — Spanish strawberries, Indian rice, and American almonds carrying their aquifers abroad.
References
This reference provides supporting context for how “Virtual Water” is defined and used.
Source imported for editorial provenance.
Overview
How it is used
The concept structures water footprint assessment, trade-water policy analysis, corporate water risk in agricultural sourcing, and national water strategy in arid economies.
Why it matters
Virtual water is how the world actually shares water — not through pipes, but through trade; ignoring it misreads every nation's true water budget.