A journey to the Jianggendiru glacier - in pictures

Geologist, explorer and environmental activist Yang Yong leads an expedition to the source of the Yangtze, to monitor the scale of the damage caused by climate change on the Tibetan plateau and the degradation at the headwaters of Asia's longest river. The journey, over treacherous terrain at high altitude, and in a region of ongoing political and ethnic tensions, has only been made by a handful of foreigners to date. But this year, Yang invited a handful of disciples, journalists and athletes to commemorate the 30th anniversary of his first downstream navigation of the river in a dinghy