Generally reducing greenhouse gas emissions is associated with providing other environmental benefits but in a Washington Post article the director of research and technology at Rolls-Royce, Richard J. Parker, says that focusing on reducing carbon dioxide emissions by engineers might result in new engines that are noisier or produce more of the environmentally troublesome nitrogen oxides than present engines. In the words of Parker:
"Will people living near airports win out, or will the planet as a whole win out?"
Not a great choice. Of course, there is always the option of flying less but this also has negative consequences, particularly for people in less developed areas who depend on hoards of tourists booking their hotels to survive economically. It seems that choices have to be made and everyone can’t win.