Hsct

The basis for concern is that the HSCTs are designed to fly at much higher altitudes than the existing commercial jets and hence increase direct emissions into the stratosphere. The HSCT was proposed to carry about 250-300 passengers and to fly from Los Angeles to Tokyo, for example, in about 4 h, compared to more than 10 h for subsonic aircraft. These aircraft emit NOx, CO, C02, H20, S02, and soot. Our understanding of the chemistry of the stratosphere is now much more detailed. The effects of emissions of NOx as well

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