Wang Tianchang, 78, and his family walk through square grids of grass and bushes planted by hand to prevent sand movement, a practice known as "holding down the sand", while planting Huabang, a yellow flowering bush known as the "sweetvetch", on the edge of the Gobi desert on the outskirts of Wuwei, Gansu province, China, April 15, 2021. Picture taken with a drone. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland. The flowering bush known as the sweetvetch has an 80% success rate even in harsh desert conditions and has become a key part of efforts to "hold down the sand". REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY