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The retreat of the glaciers is another manifestation of climate change affecting the region. Thus, the Bolivarian Republic of Venezuela, Colombia, Ecuador and Chile show


Mean changes in runoff Water availability in percentages


evidence of reductions in the size of their glaciers; in Peru and the Plurinational State of Bolivia, the shrinkage of the glaciers, compared to 1970 and 1975, is even more striking (figure


Chacaltaya glacier


30 %


10 0


-10 -30


Note: Mean changes in annual runoff between 1980-1999 and 2090-2099 for the SRES A1B emissions scenario.


0 100 200


Source: Parry, M.L. et al. : Technical Summary. Climate Change 2007: Impacts, Adaptation and Vulnerability, Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, 2007.


Figure 1.5 0


Retreat of seven Andean glaciers Cumulative evolution of length in metres 1980


1970


- 200 - 400 - 600 - 1 000 - 1 200 - 1 400


300 metres


Source: CAN, UNEP and Spanish Agency for International Cooperation, ¿El fin de las cumbres nevadas? Glaciares y Cambio Climático en la Comunidad Andina, 2007.


Figure 1.6a


1963 1983 1996 2000 2003 2006


1650


1990


2000


Antizana 15a Antizana 15b Broggi


Uruashraju Yanamarey Cajap


Pastoruri


Source: CAN, UNEP and Spanish Agency for International Cooperation, ¿El fin de las cumbres nevadas? Glaciares y Cambio Climático en la Comunidad Andina, 2007.


Figure 1.6b


10


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