Macedonian Ecological Society is organizing the Third Congress of the Ecologists of the Republic of Macedonia, for following the achievements of ecology in Macedonia and the other countries in the region, as well as the need for exchange of experience and knowledge appropriate to the scientific conditions of scientists and experts in the region but also the general public interest in better, cleaner and healthier environment. Macedonia needs organization of a joint Congress of fundamental ecology and environmental science to assure better communication of all scientists in the region. The Congress will present the knowledge of the modern basic ecology and environmental science accumulated recently. That is the reason why the papers at the Congress will be presented through different thematic sections. Each section will start by presenting case studies chosen by the Scientific Committee from the proposed papers. Apart from this, plenary sessions, prepared by eminent ecologists from Macedonia and other countries will present the achievements of modern ecology.