Through environmental protection policies today, one of the pressing problems of the whole world can be and must be act upon – climate changes. The very creation of laws, strategies and rules related to environmental protection happened precisely because of the increasingly vivid observation of the consequences of global warming on ecosystems, living beings, and humans itself. Consequently, the Final Paper starts from environmental protection policies in the European Union; their origin and development, the currently most important European Green Plan, goals and principles, but also the supervisory institutions that oversee the prescribed laws. Therefore, after analyzing the general situation and applicable rules in the European Union, the focus of the Final Paper shifts to the Republic of Croatia. What is the impact of climate change on the Republic of Croatia, which sectors are most affected, and which strategies and measures the Government of the Republic of Croatia is implementing in order to face the problem of global warming; are some of the issues discussed in this paperwork. In addition to the above, the successful implementation of the European Green Plan in the Republic of Croatia is examined and the necessary reforms for further progress are indicated. In the last thematic unit, the special emphasis has been put on the local level. Are Croatian cities sustainable and how many investments in sustainability is waiting us in the near future? The city of Split, its future development strategy and the Action Green Plan, with which the city wants to become the first Croatian green city, are analyzed.