Reducing emissions from commercial aircraft is a top priority for the aviation industry. Worldwide, carbon dioxide emissions from jet engines are responsible for around 2.5% of global greenhouse gas emissions (private aircraft contribute a further 1%). While this is less than the emissions from cars and trucks, which account for 12% of global carbon dioxide emissions, it is still significant enough to require urgent action. Airbus and Toshiba believe they have a potential answer to the problem, and their collaboration could bring about transformative changes to aviation.