The household consumption is the activity which has the largest induced CO2 emission in Japan. The household directly emits only 9% of the total CO2 emission from consuming energy in activities such as cooking, heating and driving a car. Therefore people don't recognize explicitly their responsibilities for CO2 emission. It is for this purpose that we construct the CO2 emission score table to provide information on CO2 contents in the purchases of goods and services. The score table shows the CO2 emission for every 10thousand yen of expenditure it reveals that a large differences exist between the commodities consumed.