To calculate total life-cycle emissions (based on Chester, 2008 study in the US), input distances and parameters for all the modes and click LCA. The total personal emissions will appear under the LCA button. If repeated, the difference relative to the previous calculation will appear as well. In addition, under each mode, its total emissions related to a given distance is listed along with the per-distance and per-passenger factors. Average lifetime mileage (LTM) of 241 000 km for an automobile is assumed. In addition, two other LTM scenarious are proposed based on the original study.