二十一世纪来临，当人们在欢庆新世纪新千年的同时，人类赖以生存的环境却向我们敲响了警钟：森林被大片砍伐。湿地横遭破坏，沙漠化加剧地震频繁水旱灾交替出现。人类面临着一个满目疮痍的地球。国内黄河几度断流，淮河九江段一度无法通航，黄河以北赤旱千里，已几年不见的沙 At the same time that the 21st century is approaching, as people celebrating the new millennium of the new century, the environment upon which mankind depends for survival rattles us: the forests have been deforested. Widespread destruction of wetlands, intensification of desertification, frequent earthquakes and floods and droughts appear alternately. Man faces a devastating earth. The Yellow River in China stopped several times and the Jiujiang section of the Huaihe River was once inaccessible. In the north of the Yellow River,