中国与世界，环境危机大家谈 WHERE CHINA AND THE WORLD DISCUSS THE ENVIRONMENT
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在尼日利亚北方，丰收季节过后农民是十分欢迎牧民的。牧民的牲畜吃掉残茎茬子，而它们留下的粪便对土壤也有好处。
像这种不需要花钱的交易非常重要，然而经济学家和政策规划者却常常选择忽略.。
Sedentary farmers in northern Nigeria welcome pastoralists after the harvest season - livestock eat the stubble and their excrement conditions the soil.
This is a valuable cashless transaction which economists and planners ignore.
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