It concluded that seven in 10 of the more than 3,100 US counties could
face risk of fresh water shortages. The report includes maps that
identify those places.
Sujoy B. Roy, director for research and development (R and D), Tetra
Tech Inc., Lafayette, US, and colleagues explain that population growth
is expected to increase the demand for water for municipal use and for
power generation beyond existing levels.
Global climate change threatens to reduce water supplies due to
decreased rainfall and other factors compared to levels in the 20th
century, the Journal of Environmental Science and Technology reports.
Roy's group developed a "water supply sustainability risk index" that
takes into account water withdrawal, projected growth, susceptibility to
drought, projected climate change and other factors in individual US
counties for the year 2050, according to an American Chemical Society
statement.
Roy's team used the index to conclude that climate change could foster
an "extreme" risk of water shortages that may develop in 412 counties in
southern and southwestern states and in the southern Great Plains.
"This is not intended as a prediction that water shortages will occur,
but rather where they are more likely to occur, and where there might be
greater pressure on public officials and water users to better
characterize, and creatively manage demand and supply," Roy said.
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