 Complete the following phrase:  The research investigates the impact of airplane emissions upon the climate. Led by Professor David Lee, this research group uses a range of modelling tools to calculate global aviation emissions and scenarios, contrail coverage and simplified climate response models of aviation-specific effects. With the evidence stemming from this research, the group provides advice and support on aviation related climate change issues for UK Government Departments and to fora such as the International Civil Aviation Organization and the UN Framework Convention on Climate Change. The importance of CATEs work in this field is reflected by the contribution of four CATE researchers to the IPCCs seminal 1999 report Aviation and the Global Atmosphere. The IPCC was jointly awarded the 