This book assembles the revised papers of an international conference and thus offers a comprehensive comparative overview of the participation and litigation rights of environmental associations in Europe. This is supplemented by a compilation of the relevant statutory law in force. Besides the legal background, the focus of interest is above all on practical experience with participation and litigation rights from the point of view of the environmental associations.The contributions show that the effectivity of group actions is extremely high. In none of the analysed countries were there the slightest indications of any undue strain being placed on the judicial system by this instrument. There can be no doubt that the participation and litigation rights of environmental organizations are important instruments in reducing the enforcement deficit in environmental protection. With a view to the fact that Europe is growing more and more into one entity, the need of participation of environmental NGO's on the European level becomes a pressing necessity.