Answer: China
Notes: The Three-North Shelter Forest Program, or Great Green Wall of China, aims to halt Gobi Desert expansion through windbreaking shelterbelts. The Great Green Wall of the Sahara and Sahel, initiated by the African Union, employs reforestation, water harvesting, and improved land use to combat Sahara Desert growth. The Green Wall of India seeks to prevent the Thar Desert's eastward spread with a green belt from Porbandar to Panipat, focusing on afforestation of the Aravalli Range.
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