他们的方法足够灵活，原则上可以纳入其他重要的生活质量变化，如减少污染物排放总量、降低犯罪率。
Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.
他们说这种“超超临界的”熔炉可能让燃烧效率超过50%，并进一步减少污染物排放。
Such “ultra-supercritical” boilers, they say, could achieve efficiencies of over 50%, reducing emissions still further.
次世代可允许飞机采取被称国持续降落进场（CDA）的动作，从而事实上关闭引擎，节约燃料，减少污染物排放。
NextGen will allow planes to make what is called a continuous-descent approach (CDA), essentially letting them turn off their engines, saving tons of fuel and reducing pollutants.
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