Reuters:

Climate change and the fast diminishing glaciers in the Andes are posing a serious threat to water supplies in the Bolivian highlands. The rapid pace at which glaciers are melting in the Andes mountain range is posing a serious threat to the water supply of many Andean countries, and particularly Bolivia. Scientists expect that global warming will melt most Andean glaciers in the next 30 years, an event that will threaten the livelihood of millions of people who depend on them for drinking water, farming and power generation. …

I couldn’t find any shots of the Milluni Valley before 2008, but clearly the situation has not improved.   2008 Milluni Valley, Bolivia. Published 8 Dec 2008. Reuters   2009 Milluni Dam, Bolivia. 12 February 2009. Reuters Milluni Dam, Bolivia. 12 February 2009. Reuters The Milluni reservoir has receded as glaciers that provide some of Bolivia's water and electricity have melted and disappeared. Ángel Franco / The New York Times A view of Milluni water reservoir in the Bolivian highlands, some 30 km (18.6 miles) from La Paz November 7, 2009. The "El Nino" weather phenomenon has brought on a severe drought in Bolivia, putting precarious water supplies to some of the country's major cities further at risk. Reservoirs across the country are at an alarming low levels and many Bolivians are complaining that they do not have access to water. Picture taken in November 7, 2009. Reuters The Milluni reservoir lies dry near La Paz, Bolivia, on Friday. The reservoir is fed by waters from mountain snow that has diminished in an apparent sign of climate change. PHOTO: EPA