わが国の貿易に伴うCO₂ 排出量の推計

抄録

Greenhouse gas emissions have increased rapidly in non-Annex B (developing countries). However, some of non-Annex B GHG emissions are transferred to Annex B (developed countries) for consumption purposes, which are embodied in international trade. The authors calculate CO₂ emissions embodied in Japan’s international trade from 1995 to 2005. The calculation is conducted by multi-region input-output (MRIO) model that includes emissions from processes and production methods (PPMs) in 26 states. This model shows that embodied CO₂ emissions in Japan’s imports are 276 Mt CO₂ in 1995, 303 Mt CO₂ in 2000 and 403 Mt CO₂ in 2005 (MER). These results reveal the embodied CO₂ emissions in international trade are relatively huge and its reflection is crucial to the discussion of policy-making in post-2012 regimes. To take count of embodied CO₂ emissions in trade the authors emphasize the importance of consumption accounting principle as well as present production accounting principle.