According to British researchers, one person traveling one mile in an individual car consumes 8,100 BTU, while the same person traveling the same distance in a public conveyance uses only 3,800 BTU. Moving one ton of goods one mile in a truck takes 28,000 BTU, while by train it takes only 670 BTU.
根據英國的研究，把一個人送一英哩遠，自行開車要花 8100BTU（英制熱能單位），坐公共汽車只需 3800BTU；而把一噸貨物送一英哩，用卡車需要 2800BTU，用火車則只需要 670BTU。