Relationship between self-sufficiency rate of food and CO2 emission in Japan
2003
Miyawaki, O. (Tokyo Univ. (Japan)) | Kaminishi, K. | Sawada, K. | Sagara, Y. | Okubo, A.
LCA inventory data based on input-output tables was used to analyze the relationship between the self-sufficiency rate of food and CO2 emission in Japan. For food item i with the total consumption Ci [M\] and self-sufficiency rate xi, the total amount of CO2 emission is composed of (1) domestic production of i, (2) production of industrial product; to be exported for the import of i, and (3) transportation to export;1 and import i. According to this model, an effective carbon emission coefficient, sigmaeffij was calculated for food item i by assuming the industrial item j to be exported. Then, sigmaeffij was averaged among i proportionally to their amount of annual export statistics and the effective carbon emission coefficient sigmaeffij was calculated for each food item. Because of the low self-sufficiency rate of food (- 40%), the amount of carbon emission was proved to have substantially increased in Japan. The self-sufficiency rate of food based on C-emission is only 13.6% in Japan. The difference between the present C-emission and that by assuming 100% food selfsufficiency easily reached the goal to reduce CO2 emission by COP3. This means that an increase in food self-sufficiency rate can be an effective option to reduce CO2 emission in Japan.
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