AP CAPTION-A boat full of tourists passes by the Perito Moreno Glacier in Santa Cruz province, Patagonian southern Argentina , some 3,200 kilometers, (2,000 miles) south of Buenos Aires, Thursday, Oct.16, 2003. A study suggests, that melting of glaciers in the Patagonian ice fields of southern Argentina and Chile has doubled in recent years, caused by higher temperatures, lower snowfall and a more rapid breaking of icebergs.