他们发现，飞机消耗的燃料减少了15%（同时二氧化碳排放量也减少了）。
They found that the aircraft consumed as much as 15% less fuel (coupled with a reduction in carbon dioxide output).
与此同时，空气中的二氧化碳含量正迅速接近政府间气候变化专门委员会（IPCC）提出的上限。
In the meantime, the amount of CO2 in the air is rapidly approaching the limits proposed by the Intergovernmental Panel on Climate Change (IPCC).
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