En realidad no todos los glaciares est�n reduciendo sus masas de hielo, y los que lo hacen no lo hacen a la misma velocidad ni volumen. Este es el caso del glaciar Vadret da Morteratsch en los alpes suizos que en los �ltimos cuatro a�os habr�a reducido su tasa de decrecimiento luego de haberse acelerado hasta un r�cord de 30 metros por a�o[1].
Como se ve en la imagen, compuesta de dos im�genes durante el periodo de aceleraci�n del derretimiento del glaciar, vemos que en la fotograf�a inferior tomada en septiembre del 2006 los cambios apenas pueden percibirse con respecto a la fotograf�a superior que corresponde a 1994. No obstante, este glaciar ha venido derriti�ndose mucho antes de la Revoluci�n Industrial aunque las primeras mediciones de los cambios de longitud del glaciar datan de 1878.
En la imagen de Google Earth vemos en perspectiva el pasado y presente del �rea de Pontresina, Bernina. El municipio de Pontresina se encuentra sobre un valle glaciar dejado por la �ltima edad de hielo que finaliz� hace 12,500 a�os, mientras que el valle pr�ximo al frente del glaciar de Vadret da Morteratsch estuvo cubierto por glaciar durante la peque�a edad de hielo. Ninguna de estas evidencias de retrocesos glaciares est�n influenciadas por el hombre.
1."Glaciers online: Morteratsch". Glaciers online. Retrieved on 2007-01-18.
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