The goal of this article is to inspect the effectiveness of Multi-Level Governance on environmental regional cooperation in the Baltic Sea Area from the viewpoint of Poland as a transition country and EU accession country. In the Baltic Sea Region, there is the Helsinki Convention that is a core international environmental regime. However, after 1990, with EU eastern enlargement, many environmental regimes have mushroomed. How such Multi-Level Governance affect the Polish environmental policy is examined.
As conclusions, the environmental governance in the Baltic Sea Region is a complement to accession countries which are very busy to accept EU environmental acquis communautaire, and promotes the capacity building of Polish municipality's officials. Besides, because this governance system encourages the sharing and diffusion of knowledge, know-how, and experiences passing across EU border, it will be possible to solve the Kariningrad problem.