根据研究 ,对 118个国家在 1990～ 2 0 2 5年期间水的供应和需求情况进行了预测 ,并说明了缺水越来越严重地区的自然和地理分布情况。在亚洲和中东的半干旱地区 ,包括某些世界主要产粮区 ,地下水位正以惊人的速度下降。地下水枯竭问题 ,是对 2 1世纪粮食安全的主要威胁 ,亟需引起专业人士和政策制订者的重视 According to the study, the water supply and demand in 118 countries from 1990 to 2025 were predicted and the natural and geographical distribution of water-stressed areas was described. In the semi-arid regions of Asia and the Middle East, including some of the world’s major grain-producing areas, groundwater tables are declining at an alarming rate. The depletion of groundwater is a major threat to food security in the 21st century and is urgently needed by professionals and policymakers