As Part of a research project, CO2 balancing was conducted on a total of 34 real and 480 generated bridge structures [1]. The objective was to acquire empirical data on how much CO2 is emitted by different bridge designs. Additionally, the study aimed to identify the major CO2 emitting components and subsequently optimize them. Unexpectedly, it was found that the decking is one of the major CO2 emitting components of pedestrian and bicycle bridges, which can significantly exceed the CO2 emissions of the load-bearing superstructure. Especially the CO2 emissions of synthetic products occurring over the bridge’s service life are very high, particularly when the decking needs to be regularly replaced. Comparative studies and actually built examples of bridges show that a concrete decking, with delicate prestressed carbon reinforcement, presents a novel alternative, that is significantly more durable than conventional systems and responsible for much lower CO2 emissions. Following the relevant calculations, said system was implemented during the construction of three bridges in the Ahr Valley.