Six Decades of Warming not unusual, unnatural or unprecedented

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From CO2 Science:

The authors write that "the Andean snowpack is the main source of freshwater and arguably the single most important natural resource for the populated, semi-arid regions of central Chile and central-western Argentina," as it "provides most of the water needed for human consumption, agriculture, industries, hydroelectric generation and aquifer recharge." And, hence, the world's climate alarmists are wont to agonize over what global warming might do to this precious natural resource.

A paper published in the Journal of Geophysical Research shows that "Contrary to the worries of climate alarmists, it would appear that there is nothing unusual, unnatural or unprecedented about the highs and lows of the Andean snowpack over the last six decades of global warming."

Citation: Masiokas, M. H., R. Villalba, D. A. Christie, E. Betman, B. H. Luckman, C. Le Quesne, M. R. Prieto, and S. Mauget (2012), Snowpack variations since AD 1150 in the Andes of Chile and Argentina (30°–37°S) inferred from rainfall, tree-ring and documentary records, J. Geophys. Res., 117, D05112, doi:10.1029/2011JD016748. 

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