A major international conference on "30 years of EC environmental law" was held in Bremen on September 24 and 25, 2004. The conference has brought many outstanding environmental law experts from all over Europe together to critically assess what has been achieved and what should be done in the future. The subjects of the conference included competences and principles, horizontal and sectoral measures, the "greening" of other policies, implementation, judicial review, interaction with exemplary national legal orders, and external policies. The conference was meant to honour Ludwig Kraemer at the occasion of his retirement from his service in the European Commission.