What is the man's advice on reducing air pollution?

这位男士对减缓空气污染有什么建议？

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By reducing air pollution levels, we can help countries reduce the global burden of disease from respiratory infections, heart disease, and lung cancer.

通过降低空气污染水平，我们也可帮助各国减少因呼吸道感染、心脏病和肺癌所造成的全球疾病负担。

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The ability to exploit metroplex concepts that enable optimal use of runways at multiple airports within metropolitan areas, as a means of reducing air traffic congestion and delays.

发掘大都会观念的能力，使大都市区域内的多个机场的跑道得到最佳利用，以此作为减少空中交通拥堵和延误的一个手段。

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ATLANTA, Georgia (CNN) -- When there's talk of reducing air pollution, electric vehicles seem to get much of the attention.

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The only unambiguously effective method of reducing the long-term carbon and energy cost of air travel is to fly less a behavioral change, not a technological one.

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"With proper regulation and enforcement, gas provides a very substantial health benefit in reducing air pollution, " compared with coal-fired power plants, said Daniel Schrag, director of Harvard University's Center for the Environment.

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