Greenhouse gas (GHG) emission of transportation sector was estimated by method of topdown approach (TDA) in Korea. Emission as TDA has the merit of being easy calculating andaccuracy in the aspects of national total amount, it is difficult of establishing reductioncountermeasures of road transport sector. For set up a reduction polices, the method of bottomup approach (BAU) is essential for reduction of GHG emission. This paper will be presentedthat GHG emission of road sector subdivides the classes of emission activity and estimates theemission as road type and logic of GHG emission model.
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