Sustainable development under ambitious medium term target of reducing greenhouse gases

摘要

Japanese government submitted the medium-term target to the secretarial office of Framework Convention on Climate Change that Japan would decrease 25% of greenhouse gases compared with 1990 emissions. This commitment was highly evaluated worldwide. However, some experts criticize that it is impossible to maintain sustainable development under such severe target. This article aims at investigating whether we could realize sustainable development under such ambitious target of reducing greenhouse gas emissions. For this purpose, we first evaluated possible technology options and system innovation along with economic options. Technology options include efficiency improvement, renewable energy technologies and nuclear power technologies. Economic options include carbon tax, emissions trading scheme and feed-in-tariff for renewable energies. Once the promising technologies and policy options were listed up, we integrated these options in a computable general equilibrium model for Japan, which we developed, so as to evaluate the impact to national economy. As results, we identified the condition, how we could realize sustainable development under the 25% target of reducing greenhouse gas emissions.