抄録
The purpose of this study is to evaluate greenhouse gas (GHG) emissions reduction potentials in world regions and to
estimate marginal abatement costs (MAC) through 2020. This study covers 21 geographical world regions and estimate MAC
by using detailed technology selection database. In the result, reduction potentials are estimated as 2.5~3.6 GtCO2 eq and
6.4~7.7 GtCO2 eq in Annex I and Non-Annex I respectively, under the case of 100 US$/t-CO2 marginal abatement cost in
2020. China, the United States, India, Western Europe and Russia are five major regions where there are large reduction
potentials, and it accounts for around 60 % of total reduction potentials in the world. As for the sector breakdown, large
reduction potentials in power generation and industry sectors are evaluated due to the use of low energy-efficient
technologies particularly in Non-Annex I in the current situation, and these sectors account for around 50 % of world total
reduction potentials. But major sectors which have large reduction potentials vary differently depending on the
socio-economic characteristics in each region. There are much larger potentials of cost-effective measures in developing
countries, thus international cooperation plays an important role to achieve these GHG emission reductions.
