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Figure 65. B, Shifts in timing towards acceleration in wastage of glacier volume are expressed in standardized cumulative departures. These graphs show that different glacier systems have responded to large-scale changes in climate at differing times, from the early 1970s until the end of the 1990s. This process of change in glacier volume in response to climate has taken about three decades; bi is the regional and global mass balances for individual years, i; <b> is average mass balance during the period 1961–2003.