Although I believe that Gardiner and Fragnière are right to claim that geoengineering governance demands participatory structures, I think more caution is needed. First, the public to be considered because it is affected must be differentiated depending on the geoengineering technique at issue and on the severity of its impact. Second, to avoid undermining democratic legitimacy, ethical conditions of legitimacy must be carefully assessed. Even though future generations and nature are very likely to be affected by geoengineering, their representation is (...) not as unproblematic as it might seem at first sight. (shrink)