The GreenReg project addresses the challenges of the program area, where there is a clear and well-founded need for cooperation in the field of cross-border environmental protection. The main objective of the project is to raise the level of competences of employees in development and support institutions in the cross-border region in the field of understanding and implementation of concepts and values of sustainable development. The key result pursued by the GreenReg project is to raise the sustainability competences of 30 employees in development and support institutions, carriers of the “green virus”, which will expand their knowledge either through development activities and measures, or through support to other organizations in the cross-border region (public and private private institutions, companies, associations). In addition, the most important result of the project will be digital tools for transferring knowledge that support sustainable competences. The innovative “green cloud” tool is made up of an online database of knowledge, good practices, ideas, research and links, and a user-friendly application makes it easy to search by database and push messages with news. The purpose of the tool is to gather material for the “green virus” holders and other stakeholders for the development of knowledge, the implementation of sustainable practices and the consolidation of views in one place. The GreenReg project is based on a partnership approach and the promotion of networking, which is open to new partners and stakeholders in the cross-border region. Cross-border cooperation is crucial, because it is only this way that we can transfer good practices from one region to another, thus effectively developing the competences of the defined target groups and building a common cross-border area with a unified understanding of the concepts of a sustainable development paradigm.