他们开垦了大片荒地。
但它们的间接影响：与粮食作物的竞争，额外开垦荒地种植的需要，还有在提炼过程中的消耗能源——所有都会造成影响。
But their indirect environmental "bads" -competition with food crops, the need to clear virgin land to grow them, and the energy costs of processing them-all cause anguish.
图中为云南开远市的彝族妇女在市郊的一个小山坡上开垦荒地种植桑树。
Ethnic Yi women hoe a field to plant mulberry on a hillside on the outskirts of Kaiyuanin, Yunan.
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