Shu-Yuan Pan, Carbon Cycle Research Center, National Taiwan University, Taipei, Taiwan, Seth W. Snyder, Clean Energy and Transportation, Idaho National Laboratory, Idaho Falls, ID, Aaron I. Packman, Department of Civil & Environmental Engineering, Northwestern University, Chicago, IL, Yupo J. Lin, Energy Systems Division, Argonne National Laboratory, Argonne, IL and Pen-Chi Chiang, Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan