20世纪90年代初,有关人士在南亚上空距地面14千米处发现了一片褐色的云雾,据科学家推测,它可能会对亚洲及全球的气候、农作物和经济发展产生令人担忧的影响。至1995年,亚洲褐云又有了继续扩大的趋势,并使全球气候,特别是亚洲气候出现明显的异常。为了弄清亚洲褐云对地球产生的影响和危害,联合国环境规划署组成了一个有全世界200多名科学家参加的联合考察小 In the early 1990s, people in the area discovered a brown cloud 14 kilometers above the surface of South Asia. According to scientists’ estimation, it may have an appalling impact on the climate, crops, and economic development in Asia and the world. By 1995, Asian Brown Clouds had continued to expand, and the global climate, especially the Asian climate, had become apparently anomalous. In order to understand the impact and harm caused by the Asian brown cloud on the earth, the United Nations Environment Programme has formed a joint investigation visit with more than 200 scientists from around the world.