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A World induced Technical Change Hybrid Model

Valentina Bosetti, Carlo Carraro, Marzio Galeotti, Emanuele Massetti, Massimo Tavoni

Year: 2006
Volume: Hybrid Modeling
Number: Special Issue #2
DOI: 10.5547/ISSN0195-6574-EJ-VolSI2006-NoSI2-2
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Abstract:
The need for a better understanding of future energy scenarios, of their compatibility with the objective of stabilizing greenhouse gas concentrations, and of their links with climate policy, calls for the development of hybrid models. Hybrid because both the technological detail typical of Bottom Up (BU) models and the long run dynamics typical of Top Down (TD) models are crucially necessary. We present WITCH � World Induced Technical Change Hybrid model � a neoclassical optimal growth model (TD) with energy input detail (BU). The model endogenously accounts for technological progress, both through learning curves affecting prices of new vintages of capital and through R&D investments. In addition, the model captures the main economic interrelationships between world regions and is designed to analyze the optimal economic and environment policies in each world region as the outcome of a dynamic game. This paper provides a detailed description of the WITCH model, of its Baseline, and of the model calibration procedure.



Diffusion of Climate Technologies in the Presence of Commitment Problems

Taran Faehn and Elisabeth T. Isaksen

Year: 2016
Volume: Volume 37
Number: Number 2
DOI: 10.5547/01956574.37.2.tfae
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Abstract:
Publicly announced greenhouse gas (GHG) mitigation targets and emissions pricing strategies by individual governments may suffer from inherent commitment problems. When emission prices are perceived as short-lived, socially cost-effective upfront investment in climate technologies may be hampered. This paper compares the social abatement cost of a uniform GHG pricing system with two policy options for overcoming such regulatory uncertainty: One combines the emissions pricing with a state guarantee scheme whereby the regulatory risk is borne by the government and one combines the system with subsidies for upfront climate technology investments. A technology-rich computable general equilibrium model is applied that accounts for abatement both within and beyond existing technologies. Our findings suggest a tripling of abatement costs if domestic climate policies fail to stimulate investment in new technological solutions. Since the cost of funding investment subsidies is found to be small, the subsidy scheme performs almost as well as the guarantee scheme.





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