Most of the consumed goods that are daily consumed come with a water footprint (flowers, milk, meat), 6000L/d are consumed by a person every day. This consumed/polluted water, supply chains of products, organization, or nations:
-Blue water: Ground and surface water (« loss » from river basin by evapotranspiration, product integration, or discharge in other basins or the sea).
-Green water: rainwater (« loss » is due to evapotranspiration of rainwater by plants).
-Gray water: polluted blue water (measured by the required volume of water to dilute wastewater).
In order to explain the water footprint of Germany and its impact on the world, Mr. Jonas Bunsen mentioned the importance of combing the global hydrogeological data with input-output (EE-MRIO) analysis in helping us to approximate and to investigate the water footprint of Germany in the world.
Dr. Masaharu Motoshita from his side showed that 60% of Japan depends on other countries for 60% of the total demand of freshwater, while all of the overconsumption occurs in other countries, especially the developing ones, that irrigation water demand is critical in overconsumption, but other industrial activities also matter and that small amounts of overconsumption in some watersheds can not be disregarded in the context of local sustainability of freshwater.
Reported by: Hana Ben Mahrez, Eötvös Loránd University, Budapest