Carbon emissions for transportation are determined by entering relevant data into software that calculates the total. Such data includes the shipment distance for each stage in the shipping process (as illustrated in the graphic showing four stages where transport is necessary), the mode of transport (ship, plane, truck), and the weight of the item.
運輸的碳排計算原則，是把各階段的「運送距離」（如附圖的 4 段運送）、「使用的交通工具」（船舶、飛機、貨車），以及「貨品重量」一一帶入軟體而得。