Arid land afforestation highlights the tension between engineering infrastructures and cultivating healthy ecosystems, as planting is rarely used in a restorative sense. Rosetta Sarah Eklin via Topos "Green Wall Infrastructure in China"
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The term arid has a range of connotations that vary by culture and historical period. For some, it implies barren wastelands while for others it evokes landscapes of biological cultural and aesthetic richness. From a scientific standpoint, aridity refers to a scarcity of moisture, in which precipitation is exceeded by potential evapotranspiration (i.e., the amount of water that would be consumed by plants and evaporation when unlimited water is available). James Wescoat, Aga Khan Professor, MIT via Dumbarton Oaks 
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