ICAO has been working on addressing aviation emissions since 1996 but has failed to take meaningful action. In 2013, the ICAO council established expert groups to evaluate market-based measures (MBMs) to reduce emissions, but the high level group was unable to agree on implementing global MBMs. Without agreement at ICAO, the EU moved forward with including aviation in its emissions trading scheme starting in 2012. ICAO now aims to provide guidance for countries to include international aviation in their national emissions trading programs but has ruled out a global trading scheme of its own.