Agence France-Presse: An unofficial delegation of Tibetans, the first to attend UN climate talks, said Tuesday that global warming and China’s environmental policies threatened Himalayan glaciers providing water to more than a billion Asians. Tibet, the world?s largest and highest plateau, is often called the "third pole" because it stores more freshwater in the form of glaciers than any region on Earth except the North and South poles. The region is warming at twice the global average, leading to …