Inefficient water use in irrigated agriculture and unsustainable exploitation of groundwater aquifers have further depleted the freshwater bodies and groundwater resources in many drylands.
20. 灌溉农业的水资源利用效率低下和对地下水蓄水层的不可持续的开采，进一步耗尽了许多旱地的淡水和地下水资源。