Kössler, Georg P. (2012): Geo-Engineering. Is there a Plan(et) B? (German language)
Kössler, Georg P. (2012): Geo-Engineering. Gibt es wirklich einen Plan(eten) B? Heinrich-Böll-Stiftung (ed.). Berlin (Ökologie, 25).
Political report of the Heinrich-Böll-Stiftung, a German green foundation.