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This paper investigates the economic incentives of countries to cooperate on international adaptation financing. Adaptation is generally implicitly incorporated in the climate change damage functions as used in Integrated Assessment Models. We replace the implicit decision on adaptation with explicit adaptation in a multi-regional setting by using an adjusted RICE model. We show that making adaptation explicit will not affect the optimal mitigation path when adaptation is set at its optimal level. Sub-optimal adaptation will, however, change the optimal mitigation path. Furthermore this paper studies for different forms of cooperation what effects international adaptation transfers will have on (i) domestic adaptation and (ii) the optimal mitigation path. Adaptation transfers will fully crowd out domestic adaptation in a first best setting. Transfers will decrease overall mitigation in our numerical simulations. An analytical framework is used to analyse the most important mechanisms and a numerical model is used to assess the magnitude of effects.

This paper investigates the economic incentives of countries to cooperate on international adaptation financing. Adaptation is generally implicitly incorporated in the climate change damage functions as used in Integrated Assessment Models. We replace the implicit decision on adaptation with explicit adaptation in a multi-regional setting by using an adjusted RICE model. We show that making adaptation explicit will not affect the optimal mitigation path when adaptation is set at its optimal level. Sub-optimal adaptation will, however, change the optimal mitigation path. Furthermore this paper studies for different forms of cooperation what effects international adaptation transfers will have on (i) domestic adaptation and (ii) the optimal mitigation path. Adaptation transfers will fully crowd out domestic adaptation in a first best setting. Transfers will decrease overall mitigation in our numerical simulations. An analytical framework is used to analyse the most important mechanisms and a numerical model is used to assess the magnitude of effects.

Climate change may cause most harm to countries that contribute least to greenhouse gas emissions. This paper identifies deontology, solidarity and consequentialism as the principles that can serve as a basis for a fair international burden sharing scheme of adaptation costs. We translate these principles into criteria that can be applied in assigning contributions of individual countries, namely historical responsibility, equality and capacity to pay. Specific political and scientific choices are discussed, highlighting implications for international burden-sharing. Combining historical responsibility and capacity to pay seems a promising starting point for international negotiations on the design of burden-sharing schemes. From the numerical assessment, it is clear that UNFCCC Annex I countries carry the greatest burden under most scenarios, but contributions differ substantially subject to the choice of an indicator for capacity to pay. The total financial contribution by the Annex I countries could be in the range of $55-68 billion annually.

The Global Integrated Sustainability Model (GISMO), developed at the Netherlands Environmental Assessment Agency (PBL), is a platform for analysing the complexity of sustainable development and human well-being with regards to the three sustainability domains: People, Planet, and Profit (PPP). The economic structure of the GISMO1.0 model is the International Futures model, developed at the University of Denver. To better address price behaviour in the model, the Computable General Equilibrium (CGE) model DART, developed by the Kiel Institute for the World Economy, was included in the GISMO framework and integrated with the International Futures model. The DART model is tuned to the needs of the GISMO project, and is further referred to as DART-PBL. This report provides an overview of the main changes and additions to the original DART model. The changes and additions include: 1) region and sector aggregation compatible with the GISMO framework; 2) human capital accumulation based on demographics, educational attainment and health level to better address human well-being; 3) introduction of a Linear Expenditure System to distinguish between basic and luxury consumption; 4) adjusted savings to take into account different saving patterns of a changing population structure; 5) heterogenic land prices linked with the IMAGE framework to address land scarcity and environmental impacts; and 6) partial labour mobility between agricultural and non-agricultural sectors, to assess changes in income distribution.

The dominant assumption in economic models of climate policy remains that adaptation will be implemented in an optimal manner. There are, however, several reasons why optimal levels of adaptation may not be attainable. This paper investigates the effects of suboptimal levels of adaptation, i.e. adaptation restrictions, on the composition and level of climate change costs and on welfare. Several adaptation restrictions are identified and then simulated in a revised DICE model, extended with adaptation (AD-DICE). We find that especially substantial over-investment in adaptation can be very harmful due to sharply increasing marginal adaptation costs. Furthermore the potential of mitigation to offset suboptimal adaptation is investigated. When adaptation is not possible at extreme levels of climate change, it is cost-effective to use more stringent mitigation policies in order to keep climate change limited, thereby making adaptation possible. Furthermore not adjusting the optimal level of mitigation to these adaptation restrictions may double the costs of adaptation restrictions, and thus in general it is very harmful to ignore existing restrictions on adaptation when devising (efficient) climate policies.

This paper examines stability of international climate agreements for carbon abatement under an optimal transfer rule and renegotiations. The optimal transfer rule suggested to stabilise international environmental agreements (Weikard 2005, Carraro, Eyckmans and Finus 2006) is no longer optimal when agreements are renegotiated. We determine the conditions for optimal self-enforcing sequences of agreements. If these conditions are met, then transfer payments can be arranged such that no country wants to change its membership status at any stage. In order to demonstrate the applicability of our condition we use the STACO model, a 12-regions global model, to assess the impact of welldesigned transfer rules on the stability of an international climate agreement. Although there are strong free-rider incentives, we find a stable grand coalition in the first commitment period in a game with one round of renegotiations.

Integrated Assessment Models (IAMS) have helped us over the past decade to understand the interactions between the environment and the economy in the context of climate change. Although it has also long been recognized that adaptation is a powerful and necessary tool to combat the adverse effects of climate change, most IAMs have not explicitly included the option of adaptation in combating climate change. This paper adds to the IAM and climate change literature by explicitly including adaptation in an IAM, thereby making the trade-offs between adaptation and mitigation visible. Specifically, a theoretical framework is created and used to implement adaptation as a decision variable into the DICE model. We use our new AD-DICE model to derive the adaptation cost functions implicit in the DICE model. In our set-up, adaptation and mitigation decisions are separable and AD-DICE can mimic DICE when adaptation is optimal. We find that our specification of the adaptation costs is robust with respect to the mitigation policy scenarios. Our numerical results show that adaptation is a powerful option to combat climate change, as it reduces most of the potential costs of climate change in earlier periods, while mitigation does so in later periods.

In this paper analyze the economic effects of CO2 emission reductions in the Basque Country (Spain) using an applied general equilibrium (AGE) model with specific attention to environment-energy-economy interactions. Environmental policy is implemented through a system of tradable pollution permits that the government auctions. The costs of different levels of CO2 abatement are discussed, focusing on the variations of macroeconomic, sectoral and environment-energy variables. Results show that the costs for achieving the Kyoto targets can remain limited if the appropriate combination of changes in fuel-mix and restructuring of the economy is induced. Impacto económico del control del cambio climático en el País Vasco Resumen En este trabajo analizamos el impacto económico de una reducción de las emisiones de CO2 en el País Vasco. Para ello utilizamos un modelo de equilibrio general aplicado (MEGA), que presta especial atención a las interacciones entre economía, medio ambiente y energía y que implementa la política ambiental mediante un mercado de permisos de emisión regulado por el gobierno. El artículo discute el coste de reducción de diferentes niveles en las emisiones, mostrando las variaciones en las principales variables macroeconómicas, sectoriales y energéticas. Los resultados muestran que los costes de cumplir los objetivos de Kyoto pueden ser moderados, si se consiguen inducir los cambios apropiados en el mix energético y en las estructuras de producción y consumo. Palabras clave: Modelos de Equilibrio General Aplicado; Cambio Climático; Mercados de Permisos de Emisión, País Vasco

This paper shows in an empirical context that substantial cost reductions can be achieved in the implementation of Dutch national climate policy by (i) targeting the policy at the stock of greenhouse gases, thus allowing polluters flexibility in their timing of emission reductions; and (ii) integrating climate policy with other policies, thereby optimising the restructuring of the economy needed to achieve environmental policy targets. A dynamic applied general equilibrium model with bottom-up information on abatement techniques is used to show that the optimal timing of GHG emission reductions tends to follow the timing for the other environmental themes with an additional emphasis on emission reductions in the later periods. The optimal mix of technical measures and economic restructuring as source of emission reductions is affected by the strictness of environmental policy targets for all themes and hence can only be derived from an integrated analysis of these policies.

This paper studies energy bias in technical change. For this purpose, we develop a computable general equilibrium model that builds on endogenous growth models. The model explicitly captures links between energy, the rate and direction of technical change, and the economy. We derive the equilibrium determinants of biased technical change and show the importance of feedback in technical change, substitution possibilities between final goods, and general-equilibrium effects for the equilibrium bias. If the feedback effect is strong, or the substitution elasticity large, or both, our model tends to a corner solution in which only technologies are developed that are appropriate for production of non-energy intensive goods.

By-products from agriculture and forestry can contribute to production of clean and cheap (bio)electricity. To assess the role of such multi-product crops in the response to climate policies, we present an applied general equilibrium model with special attention to biomass and multi-product crops for Poland. The potential to boost production of bioelectricity through the use of multi-product crops turns out to be limited to only 2-3% of total electricity production. Further expansion of the bioelectricity sector will have to be based on biomass crops explicitly grown for energy purposes. The competition between agriculture and biomass for scarce land remains limited, given the availability of relatively poor land types and substitution possibilities. The importance of indirect effects illustrates that the AGE framework is appropriate.

Economic models suggest that in many cases, market leakage rates of greenhouse gas abatement reach the two-digit percentage range. Consequently, the Marrakesh Accords require Clean Development Mechanism (CDM) projects to account for leakage. Despite this, most project proponents neglect market leakage for their project, because the influence of an individual project on market prices seems to be negligible. Insufficient leakage accounting is facilitated by a lack of theories and applicable proposals regarding the quantification and attribution of leakage effects. The aim of this paper is to develop a proposal for the attribution of market leakage effects to CDM projects. To this purpose, we identify the transmission mechanisms for CDM project leakage, investigate the current practice of leakage accounting, and analyse alternative attribution methods for leakage effects that are transmitted through price changes. We find that project-specific approaches must fail to take account of such leakage effects. Consequently, we propose to estimate aggregate market leakage effects and attribute them proportionally to individual projects. Our proposal is based on commodity-specific leakage factors which can be applied by project developers to any emission reductions that are associated with a project?s leakage-relevant demand or supply changes. The proposal is conservative, equitable, incentive compatible and applicable at manageable costs.

This study aims at integrating a materials flow model into an economic model, such that theeconomic effects of policies on the use materials and products can be analysed. Methods for studyingmaterials and product flows do not properly take into account economic, behavioural or policy aspects.But most economic models do not consider material flows explicitly.To analyse the economic effects an applied general equilibrium (AGE) model is used. The mainadvantage is that full direct and indirect effects of policies can be analysed. A disaggregated model isused to examine the effects of materials and product policies on various production sectors, householdsgroups, employment and the use of materials.The model is applied to metal flows in the Netherlands. The results show that the effects of aregulating levy on materials may be large for some production sectors, depending on where in theproduction process the levy is imposed. The basic metal industry and large metal using productionsectors may be negatively affected by metal levies. Positive effects of the levies occur for otherproduction sectors, for example the basic chemical industries and the petroleum refineries. In mostscenarios, the labour income households can improve their real income, whilst the households oftransfer recipients observe a fall in real income. However, for most production sectors and householdgroups the effects are small. No ‘double dividend’ is found in the various scenarios.