03:32The CompassLiving on the EdgeEncroaching DesertsBBC World Service Duration: 27 minutes Wed 11th Apr 2018, 03:32 on BBC World ServiceAvailable for over a yearListen nowYin Yuzhen has planted a million trees in 70,000 hectares of desert. Show more GenresFactualBrandThe CompassSeriesThe Compass: Living on the Edge Source: BBC Online