The parameters values assumed in the model for A and B scenarios for all investigated time slices.

ka BP – thousands of years before present; ATM, ppb - atmospheric methane concentration in parts per billion units; δC13 and δD isotopic signatures of atmospheric methane or methane from specific sources. WT – tropical wetlands; WB – boreal wetlands; HV – herbivores methane source; BB –biomass burning methane source; GC – geological methane source; PF – permafrost methane source. If values differed between the A and B scenarios, the value for the second scenario is presented in brackets.