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World Bank Policy Research (2012) 6154
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How inertia and limited potentials affect the timing of sectoral abatements in optimal climate policy
Adrien Vogt-Schilb ( ) 1, Guy Meunier 2, Stéphane Hallegatte 1, 3
(01/08/2012)

This paper investigates the optimal timing of greenhouse gas abatement efforts in a multi-sectoral model with economic inertia, each sector having a limited abatement potential. It defines economic inertia as the conjunction of technical inertia --- a social planner chooses investment on persistent abating activities, as opposed to choosing abatement at each time period independently --- and increasing marginal investment costs in abating activities. It shows that in the presence of economic inertia, optimal abatement efforts (in dollars per ton) are bell-shaped and trigger a transition toward a low-carbon economy. The authors prove that optimal marginal abatement costs should differ across sectors: they depend on the global carbon price, but also on sector-specific shadow costs of the sectoral abatement potential. The paper discusses the impact of the convexity of abatement investment costs: more rigid sectors are represented with more convex cost functions and should invest more in early abatement. The conclusion is that overlapping mitigation policies should not be discarded based on the argument that they set different marginal costs (''different carbon prices'') in different sectors.
1 :  Centre International de Recherche sur l'Environnement et le Développement (CIRED)
Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR56 – CNRS : UMR8568 – École des Hautes Études en Sciences Sociales [EHESS] – Ecole des Ponts ParisTech – AgroParisTech
2 :  Alimentation et sciences sociales (ALISS)
Institut national de la recherche agronomique (INRA) : UR1303
3 :  Groupe d'étude de l'atmosphère météorologique (CNRM-GAME)
CNRS : URA1357 – INSU – Météo France
Sciences de l'Homme et Société/Economie et finances
climate change mitigation – sectoral policies – optimal policies – optimal timing – inertia – when-flexibility – how-flexibility – overlapping policies
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