This paper describes quay wall and bridge designs in different materials, which are compared with regard the the CO2-emission and the Life Cycle Analysis (LCA). For this study the requirements and boundary conditions from the Euromax Terminal quay wall, in the Port of Rotterdam, have been used. The preliminary designs of the quay wall (made during the temder phase) are presented. They consist of a concrete diaphragm wall and a steel combi wall. New designs have been proposed for the materials wood and composites. These designs resulted in a retaining wall of Azobé and a sandwich panel of Fiber Reinforced Polymers. Fotr these four qauy wall designs cost estimations were made. For the bridge comparisons four structures, all built in the city of Rotterdam, have been considered. After completing the designs, the CO2-emission during lifetime of these structures was calculated. In addition several other impact categories have been determined with help of an LCA