In recent years, trees have been one of the well studied organic carbon (C) pools in urban areas. As they are recognized as important storage sites for carbon dioxide (CO2), which constitutes the primary greenhouse gas, biological C sequestration in woody plants is suggested as a potential mitigation tool for C emission reduction in cities. Despite this significant contribution of trees, they are not benefited sufficiently in developing countries due mainly to the lack of tree inventory data in urban ecosystems (streets, parks etc.) and inadequate knowledge about their potential in C mitigation. The aim of this paper is to put forward quantitatively the C sequestration and storage of a campus area, which is an important semi-public green area in Ankara's city center.