The meaning of the concept of security has changed and expanded thorought history. The challenges of the 21st century can not be overcomed if security can not adapt to threats that have no boundaries. It refers to ecological safety primarily that has long been neglected. It is a global phenomenon that is not subjected to national boundaries. National states must include the term and the sole emergence of the environmental safety into their security systems. If they do not do so, they will spend resources on the threats that are only fictitious, and on the other side will permanently destroyhuman environment. Therefore, this paper researches the transformation of security up to date, and then looks for the use and incorporation of the environmental security within laws, agreements and other documents. The analysis within this paper takes Republic of Croatia and all of its neighboring countries (Bosnia and Herzegovina, Montenegro, Italy, Hungary, Slovenia and Serbia) as an examples. From each country the legislation and institutions that are closely related to safety have been analyzed (e.g. Department of Defense, National Security Strategy) and those which are related to environmental protection as well (e.g. Ministry of Environment, Law on Environmental Protection). The results have showed that environmental security is still not sufficiently recognized. In the end, this paper brings an overview of the bilateral and multilateral cooperation between the Republic of Croatia and its neighboring countries. Environmental security is at the level of common agreements poorly represented. On the other hand, there are plenty of regional instruments dealing with security and environmental security, but that is just what blurs the responsibilities and creates many duplications and overlappings. Environmental safety is still unknown to the most security systems in the area of Southeast Europe. It is often mixed with environmental protection, thusbecoming substitute for it. This paper is one of the first representations of the Republic of Croatia and all of its neighboring countries, their connections in the field of environmental security, and not only 'traditional' security. All countries are very rich in natural resources, therefore it is even more important to work on that area. Since the environmental safety is poorly represented in the security discourse, it remains to see how the future events will unfold. Is it neccessary for something to happen, which would become the trigger for change, or the time of environmental safety is yet to come - that is the question for further researches. 46