它们产生的排放量将取决于驱动它们的电力是如何产生的，而刹车、轮胎和道路在磨损时都会产生微小的空气颗粒。
The level of emissions they cause will depend on how the electricity to run them is generated, while brakes, tyres and roads all create tiny airborne particles as they wear out.
现行的燃烧室要想减少排放量，必须在燃料注入燃烧室之前就通过大量的空气流将燃料混合好。
To reduce emissions in existing combustors, fuel is premixed with a large amount of swirling air flow prior to injection into the combustor.
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。
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.
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