As well as creating more farmable land out of thin air, this would slash the transport costs and carbon-dioxide emissions associated with moving food over long distances.

这样做不仅可以在高空稀薄的空气中开发出更多的宜耕土地，同样亦可减少农产品的运输成本与长途运输所产生的二氧化碳排放量，还能有效降低生鲜农产品在物流过程中无法避免的衰老与腐烂现象。

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High transport costs have made them uncompetitive, and their land is not well-suited to other crops.

ECONOMIST: South African farming