China’s plan to use solar power to melt permafrost to turn a Tibetan grassland into an artificial forest on the roof of the world

Nagqu, a city with a near-polar climate in the high grasslands of Tibet, is known for its stark beauty, its wildlife and its role as the former capital of the Zhangzhung kingdom. But it has a second, more dubious distinction: it is believed to be the only Chinese city without a tree.