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?What is the estimated surface coverage of permanent freshwater bodies

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What is the volume of groundwater that is recharged per year around the world?

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Light greywater originates from:

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Water withdrawal is defined as:

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What was the percentage of people on earth that lived under freshwater shortage in the beginning of the 20st century, and what was that percentage in the beginning of the 21st century?

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Over-withdrawal and depletion of groundwater may lead to:

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How much freshwater is currently being produced per day around the world?

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Rank the following desalination technologies according to the energy consumption and costs that they expend to produce 1 m3 of freshwater (from highest to lowest):

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Complete the sentence: “An aquifer _________”

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Complete the sentence: “Surface water _________”

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