This policy addresses GHGs and NOx in the aviation sector.
"The Aeronautics European Technology Platform Advisory Council for Aeronautics Research in Europe (ACARE) developed a Strategic Research Agenda, which identified as one of its high priorities the reduction of aviation's impact on the environment. It also concluded that technological changes are needed in order to achieve by 2020 the goals of cutting CO2 emissions by 50 %, reducing NOx emissions by 80 %, reducing perceived external noise by 50 %, and making substantial progress in reducing the impact of manufacture, maintenance and disposal of aircrafts and related products on the environment."