Open letter to the ICAO for a market-based measure to reduce aviation emissions

In light of this Friday's Council of the International Civil Aviation Organisation (ICAO) where the future of a global aviation measure to combat climate change will be decided, 25 NGOs from around the globe signed and sent to the ICAO's Secretary General an open letter in which they call for the urgent need of a market-based measure to reduce CO2 emissions caused by international aviation.