The German government officially wants to use the Climate Development Mechanism to compensate its business trips in the years from 2014 to 2017. That’s good enough, of course, but using the CDM apparently means not using the EU Emissisions Trading Scheme to delete emissions in your own backyard.
By the way: The Öko-Institut asks “How additional is the Clean Development Mechanism?” in its study from 2016. One of the results is that “we estimate that 85% of the covered projects and 73% of the potential 2013-2020 CER supply have a low likelihood of ensuring environmental integrity (i.e. ensuring that emission reductions are additional and not over-estimated) (p.14).” Find more about the study and its results here.