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There
are
two
places
on
Earth
that
serve
as
canaries
in
the
coal
mine
-
regions
that
are
especially
sensitive
to
the
effects
of
global
warming.
The
first
is
the
Arctic.
The
second
is
the
Antarctic.
In
both
of
these
frozen
realms,
scientists
are
seeing
faster
changes
and
earlier
more
dramatic
effects
of
climate
change
than
anywhere
else
on
Earth.
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