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(161120) -- WUWEI, Nov. 20, 2016 (Xinhua) -- Farmers build barriers with hay to create grid patterns that stabilize sand dunes in Minqin County, Wuwei, northwest China's Gansu Province, Nov. 19, 2016. Local government planned to spend six years from 2015 to build an ecological barrier to stabilize sand and prevent desertification, which is 500km long and 1000 meters wide. (Xinhua/Fan Peishen)(wyo) (KEYSTONE/MAXPPP/Fan Peishen )