The problem is not CO2, but reactive chemicals such as nitrogen oxides released near the ozone layer, which is a particular concern with supersonic transport be

The problem is not CO2, but reactive chemicals such as nitrogen oxides released near the ozone layer, which is a particular concern with supersonic transport because of the high cruise altitude. See: http://science.sciencemag.org/content/270/5233/70 http://science.sciencemag.org/content/270/5233/70