Four specific activities have been identified as major contributors to the desertification processes: over-cultivation, overgrazing, firewood gathering, and over-irrigation.
四项具体活动已被确定为对荒漠化的主要导致的过程：过度农垦，过度放牧，薪柴采集和过度灌溉。
2
Over the last 40 years, only 4 million hectares of new irrigation have been developed, compared to 25 and 32 million hectares for China and India respectively.