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Environmental Engineering Research 2012;17(1): 27-34. DOI: https://doi.org/10.4491/eer.2012.17.1.027
CO2 Emission from the Rail and Road Transport using Input-Output Analysis: An Application to South Korea
Phirada Pruitichaiwiboon1, Cheul-Kyu Lee1, and Kun-Mo Lee2
1Korea Railroad Research Institute, Suwon 437-757, Korea
2School of Environmental, Civil and Transportation, Ajou University, Suwon 443-749, Korea
Corresponding Author: Cheul-Kyu Lee ,Tel: +82-31-460-5372, Fax: +82-31-460-5359, Email: cheul@krri.re.kr
Received: September 10, 2011;  Accepted: February 23, 2012.
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This paper deals with the evaluation of environmental impact of rail and road transport in South Korea. A framework of energy input-output analysis is employed to estimate the total energy consumption and CO2 emission in acquiring and using a life cycle of passenger and freight transport activity. The reliability of CO2 emission based on uncertainty values is assessed by means of a Monte Carlo simulation. The results show that on a passenger-kilometers basis, passenger roads have life cycle emissions about 1.5 times those of rail, while that ratio is ten times greater when the scope of evaluation regards the tailpipe. In the case of freight transport, on a million tonkilometers basis, the value for road mode is estimated to be about three times compared to those of rail mode. The results also show that the main contribution of CO2 emission for road transport is the operation stage, accounting for 70%; however, the main contribution for rail transport is the construction and supply chain stage, accounting for over 50% emission.
Keywords: CO2 emission | Input-output analysis | Transport sector
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