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Great Green Wall

 
pronunciation:
greIt grin wawl
part of speech: noun
definition 1: a multinational African initiative to fight desertification and land degradation by modification of land use, water harvesting, and the planting and maintenance of trees primarily along the southern edge of the Sahara Desert, a belt of land that stretches across the width of the continent.
definition 2: any other similar initiative to fight desertification in other regions of the world.