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A Flexible Global Warming Index for Use in an Integrated Approach to Climate Change Assessment

  • Truong P. Truong
  • Claudia Kemfert

Global Warming Potential (GWP) is an index used to measure the relative accumulated radiative effect of a tonne of greenhouse gas (GHG) compared to that of a 'reference' gas (CO2). Due to the different lifetimes of the GHGs, the GWPs are often measured over a fixed and long period of time (usually 20, 100, or 500 years). The disadvantage of this time-approach is that the index may give a good indication of the relative average effect of each GHG or total radiative forcing over the chosen time horizon, but it may not describe accurately the marginal contribution of each GHG to the overall climate change at a particular point in time, and conditional on a particular climate change policy scenario which is being considered. In this paper, we propose an alternative approach which measures the relative contribution of each GHG to total radiative forcing more accurately and in accordance with the current policy context being considered. We suggest the use of a marginal global warming potential (MGWP) rather than the existing (total or cumulative) GWP index. The MGWP can be calculated accurately and endogenously within a climate model. This is then linked to the marginal abatement cost (MAC) of the gas, estimated within an economic model linked to the climate model. In this way the balancing of the benefits and costs associated with the reduction of a unit of emission of the GHG can be achieved more accurately. We illustrate the use of the new approach in an illustrative experiment, using a multi-sector multi-gas and multi-regional computable general equilibrium economic model (GTAP-E) coupled with a reduced form climate change model (ICLIPS Climate Model, or ICM). The results show that the new approach can significantly improve on the existing method of measuring the trade-offs between different GHGs in their contribution to a climate change objective.

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File URL: http://www.diw.de/documents/publikationen/73/diw_01.c.43857.de/dp529.pdf
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Paper provided by DIW Berlin, German Institute for Economic Research in its series Discussion Papers of DIW Berlin with number 529.

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Length: 33 p.
Date of creation: 2005
Date of revision:
Handle: RePEc:diw:diwwpp:dp529
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  1. Claudia Kemfert & Truong P. Truong & Thomas Bruckner, 2005. "Economic Impact Assessment of Climate Change: A Multi-Gas Investigation with WIAGEM-GTAPEL-ICM," Discussion Papers of DIW Berlin 499, DIW Berlin, German Institute for Economic Research.
  2. Burniaux, Jean-Marc & Truong Truong, 2002. "GTAP-E: An Energy-Environmental Version of the GTAP Model," GTAP Technical Papers 923, Center for Global Trade Analysis, Department of Agricultural Economics, Purdue University.
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