Agence France-Presse: Chile’s glaciers are on the retreat, a sign of global warming but also a threat to fresh water reserves at the southern end of South America, a report has found. In a November report, the Chilean water utility — Direccion General de Aguas de Chile (DGA) — said the Echaurren ice fields, which supply the capital with 70 percent of its water needs, are receding up to 12 meters (39.37 feet) per year. Twenty of the glaciers studied receded between 1986 and 2007 in Campos de Hielo …