The research community has highlighted for several decades the implications of greenhouse gas emissions for climate change. In response, world governments have agreed to limit global temperature change to 2°C, which requires drastic reductions in greenhouse gas emissions. In advanced economies, a commitment to a 2°C limit generally represents a reduction of emissions of between 80-95% from the 1990 baseline. Despite this, emissions from international aviation increased by 53 % between 1990 and 2011 in those countries.