地球的“皮肤癌”---对土壤侵蚀环境问题的通俗理解 刘亮 西北农林科技大学水土保持研究所 马� . Ames: Iowa State University Press, 1995. 2 Montgomery D. R. Soil erosion and agricultural sustainability . Proceedings of the National Academy of Sciences of the United States o ...
迈克尔·桑德尔 http://zh.wikipedia.org/wiki/%E8%BF%88%E5%85%8B%E5%B0%94%C2%B7%E6%A1%91%E5%BE%B7%E5%B0%94 1. 《公共哲学》（Public Philosophy: Essays on Morality in Politics，2005年） 2. 《正义读本》（Justice: A Reader，2007年） 3. 《正义，怎样做才正确？》（Justice: What ...
A man-made desert is not fantastic as it sounds. Two major factors are believed to account for the growth of man-made deserts. One is that the borders of desert in arid or semi-arid regions are extended far beyond the natural true desert into more humid climat ...
The Dust Bowl from the Great Plains happened on May 11, 1934, covering half the nation with a thin layer of grit. This was an expensive lesson in the ecological history of the United States. From both economic and ecological viewpoints, most of the Great Plains ...
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