Agence France-Presse: Global warming has caused some of China’s glaciers — a source for many of Asia’s greatest rivers — to have melted by more than 18 percent over the past five years, state media reported Friday. A survey of nearly 20,000 square kilometres (8,000 square miles) of China’s glaciers showed they were on average 7.4 percent smaller than five years ago, Caijing magazine said, citing a government-funded survey. A glacier along the upper reaches of the Brahmaputra River on the Tibetan …