Frequent removal of slurry from livestock housing has thus been suggested as a way of reducing methane emissions (Sommer et al., Anaerobic digestion of manure has large potential for reducing emissions and substituting fossil fuel with renewable methane, which can be used in heating and power generation and as a vehicle fuel. However, the unknown levels of methane leakage from digesters and gas storage raises doubts about the actual mitigation effect of this technology. All options for the reduction of methane emissions need to take into consideration the entire production system, to avoid leakage from one compartment to the next and increases in nitrous oxide emissions.