Individuals, households, businesses and countries that do assessments of water use patterns at different levels have all asked "What is a water footprint?"
Full article: A Holistic and Globally Applicable Indication System for Regional Electric-Energy-Water Security
Does the water footprint concept provide relevant information to address the water–food–energy–ecosystem nexus? - ScienceDirect
UN-Water Coordinating the UN's work on water and sanitation, water
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What is a water footprint? – Water Footprint Network
Water footprint assessment of food-water-energy systems at Kathmandu University, Nepal - ScienceDirect
Assessing the impact of water use in conventional and organic carrot production in Poland
The importance of water in agriculture
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Drinking Water Quality Assessment in Distribution Networks: Water Footprint Approach- Part 1
What is Water Footprint and how to calculate it? - Iberdrola
Carbon footprint assessment of various types of solar water heater
How much water does AI consume? The public deserves to know
New Water Footprint Assessment Tool is Online - Water Europe
The traded water footprint of global energy from 2010 to 2018