Why are humans so enthusiastic about discovering traces of water on Mars, and yet do not treat the Earth's supply of "blue gold" with the same respect nor seek to share it more fairly?
So asks the World Water Development Report 2021, which argues that many people waste or misuse water because they tend to think only of what it costs in monetary terms.
That underestimates its real worth, which also includes harder-to-measure cultural or health benefits - for example, how a clean water source near home allows girls to go to school.
"Many of our problems arise because we do not value water highly enough; all too often water is not valued at all," said Gilbert F. Houngbo, chair of UN-Water, in a statement to mark the report's release on World Water Day, observed each year on 22 March.
Here are 10 facts about water and how vulnerable communities are struggling to access supplies as growing demand and a warming planet raise the risk of shortages:
Sources: UN World Water Development Report 2021, World Meteorological Organization, UNICEF (Reporting by Megan Rowling; Editing by Helen Popper for the Thomson Reuters Foundation
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