When the heat turns up in an overcrowded bar, patrons waiting for
service tend to get thirstier. In the coming decades, a similar scenario
may play out in the United States. According to a new study, more than
a third of U.S. counties may be at “extreme” or “high” risk of water
shortages by 2050. This won’t be due to a dearth in bartenders, of
course, but the result of a swelling population, along with the
potential temperature increases and precipitation changes associated
with climate change.
The research, funded by the Natural Resources Defense Council (which publishes OnEarth), appeared last week in the journal Environmental Science and Technology.
The first strike against water supplies comes from increases in
population. Projections suggest fairly linear growth between now and
mid-century, meaning the U.S. will have about 419.9 million people in
2050 (up from its current population of 313,000,000). All of those
additional Americana will have to drink, and eat food grown with water,
and turn on lights powered by water-guzzling power plants.
Then there’s climate change. Temperature is expected to increase
somewhere between 1.5 and 3° Celsius, and the warming air will be able
to hold more water. The resulting changes in precipitation aren’t
uniform by any means. Models suggest that Texas and the Gulf states
will lose more than one inch per year, while the northeastern U.S.
could get between two and four extra inches per year.
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