InputOutput Analysis of Philippine Sectoral CO2 Emissions Raymond R. Tan, Ph.D.1, Joel Q. Tanchuco,

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Input-Output Analysis of Philippine Sectoral CO2
EmissionsRaymond R. Tan, Ph.D.1, Joel Q.
Tanchuco, M.A.21Center for Engineering and
Sustainable Development Research 2Economics
DepartmentDe La Salle Unviersity-Manila, 2401
Taft Avenue, 1004 Manila, Philippines1Tel/Fax
632-536-0260 Email tanr_a_at_dlsu.edu.ph
Website http//www.geocities.com/natdnomyar/web

• SUMMARY Economic input-output (EIO) models
  combined with life cycle assessment (LCA) are
  used to estimate direct and indirect CO2
  emissions of different economic sectors in the
  Philippines. These results allow for comparison
  of carbon intensities of different sectors per
  unit of GDP contribution.
• WHAT IS EIO-LCA?
• Economic input-output analysis was developed by
  Leontief to quantify interactions within
  economies 1. The method has been extended in
  the context of life cycle assessment to estimate
  direct and indirect emissions or resource use 2,
  3.
• NOMENCLATURE
• B environmental emissions matrix
• g inventory vector
• I identity matrix
• y final demand vector in EIO model
• Z technology matrix in EIO model
• COMPUTATIONAL MODEL
• Emission balances can be computed for EIO-LCA
  using
• g B (I Z)1 y (Eq.1)
• DISCUSSION
• Figures 1 and 2 show the carbon intensities per
  thousand pesos output and emissions contributions
  of the 11 major economic sectors based on the
  2000 input-output tables 4 and sectoral direct
  carbon emissions 5. Table 1 shows the major
  indirect contributors for each of the sectors.
  For eight of the sectors, direct emissions
  account for just 20 40 of life cycle carbon
  releases. In the case of the utilities,
  transportation and real estate sectors, direct
  emissions are the dominant contributors.

ABOUT THE AUTHORS Dr. Raymond R. Tan is an
associate professor of the Chemical Engineering
Department of De La Salle University-Manila. He
has worked on environmental systems modelling at
the Center for Engineering Sustainable
Development Research since 2003. He received the
2004 OYS Award for his research on the life cycle
analysis of alternative motor vehicle fuels.
Joel Q. Tanchuco is an assistant professor of
the Economics Department of De La Salle
University-Manila. He specializes in energy and
environmental economics. He can be contacted via
email at tanchucoj_at_dlsu.edu.ph