Geoscience Reference
In-Depth Information
Figure 17.30 Glacier melting due to
climate change.
(a) Temporal assess-
ment of glacier length changes around
the world since the mid-nineteenth
century. The number of advancing gla-
ciers (vertical blue bars) and retreating
(vertical red bars) are plotted for each
calendar year based on survey obser-
vations. Note that the vast majority of
the world's glaciers have been retreat-
ing during this time span. (b) Photo of
the Grinnell Glacier in Glacier National
Park (Montana) in 1900. (c) Photo of the
Grinnell Glacier in 2008. Note the dra-
matic change in the size of the glacier.
This degree of change is representative
of glaciers elsewhere in the park.
(a)
(b)
(c)
