International efforts to protect biodiversity and ecosystems in the EU mainly center on the link between European Union (EU) law and environmental law. This study looks into the continued challenge of rules that differ among countries, which may affect the proper implementation of conservation policies in the EU. Even though environmental protection is covered by both the EU and its member states, matching rules sometimes make it difficult to know who should take action. This research aims to look at how environmental laws are incorporated in the laws of the EU, focusing especially on steps for harmonization to increase environmental protection. It looks at how EU directives, including the Habitats and Birds Directives, relate to the main goals in environmental policy. Based on a qualitative analysis, the research focuses on closely reading EU treaties, implementing guidelines, and case law, as well as comparing the results in several member countries.