The current warming trends in the Arctic may shove the Arctic
system into a seasonally ice-free state not seen for more than one
million years. The melting is accelerating, and researchers were
unable to identify natural processes that might slow the deicing of
the Arctic. Such substantial additional melting of Arctic and
Antarctic glaciers and ice sheets would raise the sea level
worldwide, flooding the coastal areas where many of the world's
population lives. Studies, led by scientists at the National Center
for Atmospheric Research (NCAR) and the University of Arizona, show
that greenhouse gas increases over the next century could warm the
Arctic by 3-5 C in summertime. Thus, Arctic summers by 2100 may be
as warm as they were nearly 130,000 years ago, when sea levels
eventually rose up to 6 m higher than today.
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