For anyone interested I wrote a thesis about Aviation and The Environment. It is available for download from the following location:
www.areco.org/ThesisLondonCityU.pdf
In the long term only new technoligies such as hydrogen fuel can help decrease emissions without stifling growth. In the meantime a lot can be done to help reduce the current amount of emissions, such as improved ATC procedures etc. The sad thing is that for all the improvements in current technologies and procedures we still have a 3% increase in emissions per 5% increase in traffic.