Green literacy as a form of information literacy appears in the 1990's. It is described as a set of conventional information literacy skills expanded to include sustainable thinking. The main task of green literacy is to influence on individuals and institutions to change their opinions and behavior. Environmental concern is topic long spoken of, but first documents which raises awareness on the issues about sustainable development and whose aim is to influence changes in the behavior of individuals and institutions don't appear until the nineties. Croatia has followed development in the area of sustainable development since its beginning and, in accordance with the events, adopted, accepted and signed international legislative documents. The paper describes the phenomenon of green literacy through its development and the role of the library in its spread within its local community and broader. The green movement arrived later in the Croatian libraries but from its beginnings till today it has been expanding intensively and successfully. The first project "Green Libraries" of the Society of Librarians of Istria is the most successful project and is the initiator of numerous "green programs" within libraries in Croatia. This paper includes an overview of the most prominent projects and activities in Croatian libraries with which libraries want to create a greener local community by spreading the green literacy and influencing on individuals to turn to sustainable development and to protect environmental protection. This papers aim is, considering the small number of papers on the theme of green libraries and green literacy in the Republic of Croatia, to draw attention to the role of libraries in the importance of advocacy and promotion of environmental protection and sustainable development and to show examples of educational programs in the context of green literacy. The purpose of this paper is to provide guidelines on educational activities and library programs which can conrtibute to promoting and raising awareness on the importance of preserving the environment and sustainable development issues.