Using the example of climate protection law, the paper deals with the process of Europeanization through legal comparison and through the effects of national legal systems among themselves and at the Union level (Europeanization “bottom up”). For this purpose, it examines the phenomenon of "expertification", which – together with participation and juridification (climate change litigation) – is currently the most important development trend in this policy area. To support the “expertification”-thesis, the paper analyzes the competencies, normative anchoring and democratic legitimacy of the German “Expert Council on Climate Issues” compared to its counterparts in the UK and at EU level. Based on this, reform proposals for the currently underpowered German expert council are made.