Urban market approaches under article 6 of the Paris Agreement : recommendations for practical implementation : final report / by Sonja Butzengeiger, Erin Danford and Ruth Kassaye (Perspectives Climate Research, Freiburg), Sarah Catto, Tarryn Quayle (ICLEI Africa, Cape Town) ; on behalf of the German Environment Agency ; report performed by: Perspectives Climate Research ; edited by: Section V 2.6 Emissions Reductions Projects - CDM (NDA)/JI (DFP) - Kruse, Marcel German Emissions Trading Authority