The Tibetan Plateau, home to the world’s largest expanse of alpine permafrost, is warming at about twice the global average but, counter-intuitively,researchers have found that ice in parts of the Tibet autonomous region is actually thickening. A team from Peking University found that shallow ground ice has unexpectedly increased over the past 20 years, affecting more than a third of the plateau’s permafrost, a phenomenon driven largely by natural climate factors. The authors noted that the...