System-Wide Perspective for Life Cycle Assessment of CO -Based C1-Chemicals : Verlag Mainz : 9783958861930 : 3958861938 : 19 Dec 2017 : In recent years, the conversion of CO2 to basic chemicals with one carbon atom (C1-chemicals) such as methane and methanol has gained increasing interest. The major motivation for the utilization of CO2 is the reduction of global warming and fossil depletion impacts. However, these reductions are not guaranteed because all C1-chemicals require hydrogen besides the abundantly available CO2. Thus, the goal of this thesis is the life cycle assessment of CO2-based C1-chemicals (methane, methanol, carbon monoxide and formic acid). The assessment is based on a system-wide perspective, which means that for limited resources such as renewable electricity also the utilization of the limited resources is in other processes is considered. First of all, the CO2-based processes are compared to fossil-based processes for C1-chemicals. Formic acid has the highest po