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A Sand County Almanac,a work about relationship between man and nature,was written by Aldo Leopold. Leopold is a famous American biologist and pioneer of environmentalism.in his book, he showed his beautiful and natural senery in his farm through his sincere and exquisite depiction along with concise refined wording. He also told us his experiences when he travelled in American lands. In the end he put forward his key theory—Land ethics.By reading between the lines,we can find his respect and favor for the nature. meanwhile,we can feel his sorrow for people’s ravaging of the land,this book is a classic work integrating, literature,environmental protection and philosophy.It is praised as the beginning of land ethics and the green bible of human environmental protection.