利奥波德在《沙乡年鉴》里指出人在决策时往往都只看事物的经济价值，不看其生态价值。人类这种为了发展经济而牺牲生态的行为等于自掘坟墓。他在书中给予了批评，用“土地伦理”理念来解决生态失衡的问题，并明确了个体为生态群体可做的具体事情。%In the A Sand County Almanac ", Leopold points out that people in decision-making often only look at the economic value of things, from its ecological value. The human in order to develop the economy is ready to sacrifice the ecological behavior. In his book, he gave the criticism, with "land ethic" concept to solve the problem of ecological imbalance, and clear the individual for ecological groups to do specific things.
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