Aviation can reduce its greenhouse gas emissions by more than 50 per cent below business-as-usual (BAU) levels by 2050, according to a new report from the Pew Center on Global Climate Change. The report, Aviation and Marine Transportation: GHG Mitigation Potential and Challenges, examines growth projections for emissions and options to reduce those emissions. It says that under BAU forecasts, CO2 emissions from global aviation are estimated to grow 3.1 per cent per year over the next 40 years, resulting in a 300 per cent increase in emissions by 2050. A range of near-, medium- and long-term options can mitigate this, including improvements in operational efficiency, improvements in the energy efficiency of engines and the design of aircraft, and transitioning to less carbon-intensive fuels and transportation modes. Implementation of these options could result in reductions of more than 50 per cent below BAU levels by 2050 from global aviation, it concludes, but for these reductions to be realised, international and domestic policy intervention is required.