water footprint: Blue, Green ...

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water footprint: Blue, Green and Grey water

The blue water refers to freshwater

The green water refers to water stored in soil

The grey water is polluted water

There are many definitions available on internet but this distinction is good to know for following debate :  globally there is enough freshwater on our planet for supporting even billion 10 persons (not if we all live like in the USA)  but if grey water with resistant radioactive or chemical wastes pollute blue and green water,   should governance include strategies of sewage and strategic water stocks?