This Intergovernmental Panel on Climate Change (IPCC) Special Report is the most comprehensive assessment available of the effects of aviation on the global atmosphere. The report considers all the gases and particles emitted by aircraft into the atmosphere and the role which they play in modifying the chemical properties of the atmosphere and initiating the formation of contrails. The report then considers how all this can modify the radiative properties of the atmosphere, leading to climate change, and can modify the ozone layer, leading to changes in ultraviolet radiation reaching the Earth. The report also considers how potential changes in aircraft technology, air transport operations, and the institutional, regulatory, and economic framework might affect emissions in the future. The volume provides accurate, unbiased, policy-relevant information to serve the aviation industry, policy-makers, environmental organisations, and researchers in global change, atmospheric chemistry, and economics.