AP BIOLOGY

Detailed explanation-1: -Drip irrigation, Sewage treatment plant (STP) Can provide water for growing trees, Forest and trees save from sand drift, forest provide timber, medicinal plants, fire wood, timber to build houses, more than 50, 000 hacters deserts can be filled with plants.

Detailed explanation-2: -Facilities have also been put into place to treat urban and industrial runoff for agricultural irrigation. These efforts collectively have helped transform vast tracts of the desert into fertile farmland. Land under cultivation, less than 400, 000 acres in 1976, reached millions of acres by the 21st century.

Detailed explanation-3: -Chinese researchers offer a solution to soil degradation: a plant paste that can turn the desert into a grassland. The new technology might help 500 million people just in Central Asia. Turning desert into fertile soil.