NewClimate Institute quantified the possible contribution of International Cooperative Initiatives to the mitigation of greenhouse gas emissions in Germany. Besides the national government many other actors—e.g. regions, cities, companies—have committed to reduce their greenhouse gas emissions. It is likely that the impact of these activities on Germany’s national emissions is significant and can lead to more emission reductions than are currently expected in national studies. This could ultimately lead to a more ambitious greenhouse gas reduction target for Germany than currently proposed. The assessment framework developed under this project can be used to assess emission reductions targets of other countries made in preparation or after agreement of a new international climate agreement to be finalised in December 2015.