Environment News Service: About 99 percent of the Chacaltaya glacier in Bolivia has disappeared since 1940, says World Bank engineer Walter Vergara, in his new report, "The Impacts of Climate Change in Latin America." One of the highest glaciers in South America, Chacaltaya is one of the first glaciers to melt due to climate change. Although the glacier is over 18,000 years old, it is expected to vanish this year. "The greenhouse gases are the main driver," says Vergara. "The …