The carbon footprint from the overall TCD process when renewable electricity and heat recovery was utilized was 0.1kg CO2/ kg acetone produced, equivalent to 3kg of CO2 released per kg of H2 generated. Table provides more information for IPA TCD on multiple scenarios. Calculations for IPA TCD carbon footprint can be found in the supplementary information. In general, the carbon footprint for storing and releasing hydrogen via thermochemical LOHC cycling process simulation with renewable and non-renewable electricity was obtained to be 5.2 and 74.3kg CO2/kg H2, respectively. A large part of the carbon footprint is attributed by the endothermic TCD reaction and the H2 upstream carbon footprint for the TCH reaction.