Retreat of Andean Glaciers Foretells Global Water Woes

Earlier this year, the World Bank released yet another in a seemingly endless stream of reports by global institutions and universities chronicling the melting of the world's cryosphere, or ice zone. This latest report concerned the glaciers in the Andes and revealed the following: Bolivia's famed Chacaltaya glacier has lost 80 percent of its surface area since 1982, and Peruvian glaciers have lost more than one-fifth of their mass in the past 35 years, reducing by 12 percent the water flow to the country's coastal region, home to 60 percent of Peru's population.

And if warming trends continue, the study concluded, many of the Andes' tropical glaciers will disappear within 20 years, not only threatening the water supplies of 77 million people in the region, but also reducing hydropower production, which accounts for roughly half of the electricity generated in Bolivia, Peru, and Ecuador.

Chances are that many of Bolivia's Aymara Indians heard little or nothing about the report. But then the Aymara -- who make up at least 25 percent of Bolivia's population -- don't need the World Bank to tell them what they can see with their own eyes: that the great Andean ice caps are swiftly vanishing. Those who live near Bolivia's capital city of La Paz need only glance up at Illimani, the 21,135-foot mountain that looms over the city, and watch as its ice fields fade away. Their loss adds to a growing unease among the Aymara -- and many Bolivians -- who realize that the loss of the country's glaciers could have profound consequences.

The Aymara worship the ice-draped mountains as Achachilas, or life-giving deities, whose meltwater is vital to a region that suffers a five-month dry season and relies on agriculture to survive. Now, as greenhouse gas emissions heat the earth, the Aymara are bracing for a future in which glaciers no longer can be counted on to supply life-sustaining water.

In recent decades, 20,000-year-old glaciers in Bolivia have been retreating so fast that 80 percent of the ice will be gone before a child born today reaches adulthood. So far this melting has brought temporary increases in stream flow and contributed to massive Amazonian floods that forced several hundred thousand people from their homes last year.

But within the next decade, scientists predict that this torrent of meltwater will turn into a trickle as glaciers shrink, meaning that the age-old source of water during the dry season will steadily dwindle. Some highland farmers near La Paz already report decreased water supplies.

"Here you have precipitation only part of the year," said French glaciologist Patrick Ginot as he stood at 16,500 feet next to Zongo glacier last year. "But it's stored on the glacier and then melting throughout the year, and so you have water throughout the year. If you lose the glacier, you have no more storage."

In effect, underdeveloped countries such as Bolivia are paying dearly for the massive energy consumption of the United States and the industrialized world. The so-called "carbon footprint" of the average Bolivian peasant is negligible, yet Bolivia's poor are not only among the first to feel the harsh effects of climate change, but also are sorely lacking the resources to adapt to it.

"The grand question here is, who compensates," says Oscar Paz, director of Bolivia's National Climate Change Program, "because we are not culpable for climate change. It's not fair that a country like Bolivia, which emits 0.02 percent of global greenhouse emissions, already has annual economic losses from the impacts of climate change equivalent to four percent of our GDP." These losses, about $400 million, are largely due to the recent Amazonian floods.

Bolivia is one of many countries, nearly all in the developing world, facing looming water shortages from melting glaciers. Up and down South America's western coast, Andean glaciers are the natural water towers to tens of millions of people, including those in the capital cities of Quito, Ecuador; Lima, Peru; Santiago, Chile; and La Paz.