Map shows threats, stress on
Condensed by Native Village
Great Lakes stress map, from
lowest (blue) to highest (red.)
Michigan: The Great Lakes
contains 20% of the world's
fresh water. Now a startling new
shows environmental threats to
their ecosystems caused by
Researchers at the University of
Michigan and other institutions
have created the most
comprehensive map to date of
Great Lakes' stressors. It's the
first to account for
all major types of stresses on the
lakes in a quantitative way.
"Despite clear societal
dependence on the Great Lakes,
their condition continues to be
degraded by numerous
said David Allan, aquatic sciences professor.
U.S. and Canadian scientists
analyzed the latest
data from federal and state
organizations and individual researchers.
Among the 34 stressors examined
pollutants transported by
rivers from agricultural and
fishing pressure, climate change,
"Current efforts to conserve,
manage and restore the Great
Lakes often take a piecemeal
approach, targeting threats one
by one," Allan said. "We need
to recognize that the Great
Lakes are affected by multiple
environmental stressors, and
devise strategies based on a
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