the impact of possible climate catastrophes on global warming policy abstract recent studies on global warming have introduced the inherent uncertainties associated with the costs and benefits of climate policies and have often shown that abatement policies are likely to be less aggressive or postponed in comparison to those resulting from traditional cost benefit analyses cba yet those studies have failed to include the possibility of sudden climate catastrophes the aim of this paper is to account simultaneously for possible continuous and discrete damages resulting from global warming and to analyse their implications on the optimal path of abatement policies our approach is related to the new literature on investment under uncertainty and relies on some recent developments of the real option in which we incorporated negative jumps climate catastrophes in the stochastic process corresponding to the net benefits associated with the abatement policies the impacts of continuous and discrete climatic risks can therefore be considered separately our numerical applications lead to two main conclusions i gradual continuous uncertainty in the global warming process is likely to delay the adoption of abatement policies as found in previous studies with respect to the standard cba however ii the possibility of climate catastrophes accelerates the implementation of these policies as their net discounted benefits increase significantly

energy transitions in small scale regions what we can learn from a regional innovation systems perspective the prevalent theories in the debate on sustainability transitions have been criticised for not sufficiently addressing energy change processes at the local level this paper aims to enhance our understanding of local energy reorganisation processes drawing on the regional innovation systems ris approach we argue that local development dynamics result from the interaction of various subsystems science politics public administration industry finance intermediaries and civil society the analysis of the involved subsystems and their interaction shows how energy transitions are shaped by different individual and organisational actors as well as institutions on the local level empirical evidence from case studies on the german cities of emden and bottrop illustrates our theoretical conceptualisation of energy transitions we conclude by presenting characteristic interaction patterns for energy transition drawn from the two cases

who governs energy the challenges facing global energy governance this article conceptualizes the energy problems facing society from a global governance perspective it argues that a notion of global energy governance taken to mean international collective action efforts undertaken to manage and distribute energy resources and provide energy services offers a meaningful and useful framework for assessing energy related challenges the article begins by exploring the concepts of governance global governance and global energy governance it then examines some of the existing institutions in place to establish and carry out rules and norms governing global energy problems and describes the range of institutional design options available to policymakers it briefly traces the role of a selection of these institutions from inter governmental organizations to summit processes to multilateral development banks to global action networks in responding to energy issues and points out their strengths and weaknesses the article concludes by analyzing how the various approaches to global governance differ in their applicability to addressing the conundrums of global energy problems

transforming the energy sector the evolution of technological systems in renewable energy technology this paper analyses the development and diffusion of technologies that utilize renewable energy sources in germany sweden and the netherlands the analysis enlarges the life cycle model of industry evolution to one where the focus is on the formation and evolution of new technological systems particular focus is on explaining success and failures in shifting from a formative phase into one characterized by positive feedbacks a set of challenges is identified for policy makers attempting to influence the process of transforming the energy sector

global warming economics in the long run a conceptual framework economic models of climate change typically analyze its short run effects for example up to the year 2100 or for a doubling of atmospheric co2 this is a potentially serious shortcoming since under a business as usual scenario atmospheric co2 concentrations could more than quadruple we introduce a framework that endogenously accounts for long run climate change and examine the implications of alternative mitigation strategies one in which the rates of annual emissions are reduced and one that places absolute limits on the total amount of carbon released we discuss alternative valuation frameworks drawing on the debate surrounding the stern review

global warming irreversibility and learning a number of economists have argued that the literature on the irreversibility effect implies that current abatement of greenhouse gas emissions should be greater when there is the possibility of obtaining better information in the future about the potential damages from global warming than when there is no possibility of obtaining better information in this paper we show that even the simplest model of global warming does not satisfy either of epstein s 1980 sufficient conditions so it is not possible to use epstein s analysis to tell whether the irreversibility effect applies to models of global warming we derive an alternative sufficient condition for the irreversibility effect to hold

future governance of innovation policy in europe three scenarios in europe public research technology and innovation policies are no longer exclusively in the hands of national authorities increasingly national initiatives are supplemented by or even competing with regional innovation policies or transnational programmes in particular the activities of the european union at the same time industrial innovation increasingly occurs within international networks are we witnessing a change of governance in european innovation policy based on a set of hypotheses concerning the co evolution of political systems and innovation systems in europe the paper speculates about the future governance of innovation policies trying to pave the ways for empirical analyses it sketches three scenarios stretching from 1 the idea of an increasingly centralised and dominating european innovation policy arena to 2 the opposite i e a progressive decentralisation and open competition between partly strengthened partly weakened national or regional innovation systems and finally to 3 the vision of a centrally mediated mixture of competition and co operation between diverse regional innovation cultures and a related governance structure

are the economic costs of stabilising the atmosphere prohibitive abstract macro economic studies of the costs of reducing co2 emissions generally estimate the global cost of stabilising the atmospheric concentrations of co2 in the range 350 550 ppm in trillions of usd this creates the impression that the cost of co2 reductions is so large that it threatens economic development but presented in another way a completely different picture emerges there is widespread agreement amongst the more pessimistic macro economic studies that stringent carbon controls are compatible with a significant increase in global and regional economic welfare even if the cost of co2 abatement rises to 5 of global income per year by the end of this century this reduction is minor compared with the tenfold increase in global income that is expected since income is assumed to grow by a couple of percent per year the trillion usd cost could also be expressed as a few years delay in achieving an order of magnitude higher income levels similar observations can also be made as regards near term abatement targets such as the kyoto protocol a more widespread recognition of the fact that carbon abatement policies will only marginally affect economic growth is likely to increase the willingness to introduce carbon abatement policies

energy conservation investment do consumers discount the future correctly we argue that the apparently high discount rates attributed to investors making energy conservation investments are not irrational or the result of some market failure rather they may result from an investor recognizing that many conservation investments entail substantial sunk costs in the presence of these costs and uncertainty over future conservation savings consumers should use a higher hurdle rate for investment than if there were no uncertainty simulations suggest that the hurdle rate should be about four times greater than the standard rate an implication of our model is that tax subsidies for the purchase of conservation capital are likely to be ineffective we discuss alternative policy approaches which are more likely to increase energy efficient investment namely mandatory efficiency standards and energy taxes

the option value of renewable energy the case of climate change decision makers receive mixed signals from the investment literature on when it is appropriate to develop renewable energy technology substitutes for fossil fuels this question is becoming more important as attention has become focused on climate change with the assumptions that information is revealed as time passes and the new technologies take a long time to develop renewable energy alternatives are more attractive than they appear on the basis of the net present value criterion that ignores option value option value represents the value of flexibility to use or discard new technologies

exploring futures for amazonia s sierra del divisor an environmental valuation triadics approach to analyzing ecological economic decision choices in the context of major shifts in boundary conditions abstract this text presents a new methodological approach to ecological economic analysis employing georgescu roegen s flow fund theory of economic process it offers an alternative to monetary valuation based analyses and aims to contribute toward advancing work concerned with addressing complex ecological economic questions as complete wholes the methodology is demonstrated through reference to the empirical case of a proposed rail link between peru and brazil which would cut across the sierra del divisor of western amazonia connecting the pacific and atlantic coasts and further opening up the amazon commodity frontier in order to analyze the potential impacts of the rail link four flow fund representations of economic process two at the regional and two at the local level are developed in order to juxtapose two alternative political economy contexts that might govern the rail link s impacts in the region one where conservation is prioritized over cash income and one where it is not our results suggest that completion of the rail link under the current political economy context which prioritizes cash income over conservation is likely to have substantial negative consequences for forest conservation in both peru and brazil and for local livelihoods throughout the region

geographies of energy transition space place and the low carbon economy this paper makes a case for examining energy transition as a geographical process involving the reconfiguration of current patterns and scales of economic and social activity the paper draws on a seminar series on the geographies of energy transition security climate governance hosted by the authors between 2009 and 2011 which initiated a dialogue between energy studies and the discipline of human geography focussing on the uk government s policy for a low carbon transition the paper provides a conceptual language with which to describe and assess the geographical implications of a transition towards low carbon energy six concepts are introduced and explained location landscape territoriality spatial differentiation scaling and spatial embeddedness examples illustrate how the geographies of a future low carbon economy are not yet determined and that a range of divergent and contending potential geographical futures are in play more attention to the spaces and places that transition to a low carbon economy will produce can help better understand what living in a low carbon economy will be like it also provides a way to help evaluate the choices and pathways available

optimal climate policy is a utopia from quantitative to qualitative cost benefit analysis abstract the dominance of quantitative cost benefit analysis cba and optimality concepts in the economic analysis of climate policy is criticised among others it is argued to be based in a misplaced interpretation of policy for a complex climate economy system as being analogous to individual inter temporal welfare optimisation the transfer of quantitative cba and optimality concepts reflects an overly ambitious approach that does more harm than good an alternative approach is to focus the attention on extreme events structural change and complexity it is argued that a qualitative rather than a quantitative cba that takes account of these aspects can support the adoption of a minimax regret approach or precautionary principle in climate policy this means implement stringent ghg reduction policies as soon as possible

discounting and distributional considerations in the context of global warming the economics of global warming is reviewed with special emphasis on how the cost depends on the discount rate and on how costs in poor and rich regions are aggregated into a global cost estimate both of these factors depend on the assumptions made concerning the underlying utility and welfare functions it is common to aggregate welfare gains and losses across generations and countries as if the utility of money were constant but it is not if we assume that a e co2 equivalent dlubling implies costs equal to 1 5 of the income in both high and low income countries a pure rate of time preference equal to zero and a utility function which is logarithmic in income then the marginal cost of co2 emissions is estimated at 260 590 usd ton c for a time horizon in the range 300 1000 years an estimate which is large enough to justify significant reductions of co2 emissions on purely economic grounds the estimate is approximately 50 100 times larger than the estimate made by nordhaus in his dice model and the difference is almost completely due to the choice of discount rate and the weight given to the costs in the developing world as well as a more accurate model of the carbon cycle finally the sensitivity of the marginal cost estimate with respect to several parameters is analyzed

monetary valuation of the social cost of co2 emissions a critical survey an expanding branch of research has estimated the potential costs of climate change which are often expressed as the social cost of carbon scc or the costs of an additional ton of co2 emissions estimates of the scc can be used by policy makers to evaluate climate change policies and greenhouse gas emission reduction projects by means of cost benefit analyses cbas such analyses are complicated by the wide range of scc values that have been reported in the literature and the large uncertainties involved in estimating the potential economic impacts and related costs of climate change this study presents a critical review of the reported scc estimates by examining some neglected consequences of climate change uncertain and extreme scenarios of climate change the discounting of future climate change effects the treatment of individual risk aversion and assumptions about social welfare in view of the many uncertainties and omissions in conventional cost benefit analyses of climate impacts and the scc alternative approaches to decision making should be considered for climate policy

natural capital in integrated assessment models of climate change in integrated assessment models iams economic activity leads to global warming which causes future economic costs however typical iams do not explicitly represent the role of natural capital in this paper the dice model by nordhaus 2008 is expanded with a natural capital variable that is affected both by climate change and by depletive effects of economic activity due to a synergy between the two effects the optimal policy of the expanded model features more and earlier abatement of co2 emissions than dice interestingly the policy implications are different from what follows if one tries to capture the depletive effects on natural capital by simply reducing factor productivity growth in dice acknowledging considerable uncertainty simulations show that climate and savings rate policies from the expanded model are more robust in the long term than policies that do not consider non climatic depletion effects on natural capital

externality or sustainability economics abstract in an effort to develop sustainability economics baumgartner and quaas 2010 neglect the central concept of environmental economics environmental externality this note proposes a possible connection between the concepts of environmental externality and sustainability in addition attention is asked for other aspects of sustainability economics namely the distinction weak strong sustainability spatial sustainability and sustainable trade distinctive sustainability policy and the ideas of early sustainability economists i argue that both sustainability and externalities reflect a systems perspective and propose that effective sustainability solutions require that more attention is given to system feedbacks notably other regarding preferences and social interactions and energy and environmental rebound the case of climate change and policy is used to illustrate particular statements as a conclusion a list of 20 insights and suggestions for research is offered

factors influencing willingness to pay for the energy star label abstract in the united states nearly 17 of greenhouse gas emissions come from residential energy use increases in energy efficiency for the residential sector can generate significant energy savings and emissions reductions consumer labels such as the us environmental protection agency s energy star promote conservation by providing consumers with information on energy usage for household appliances this study examines how the energy star label affects consumer preferences for refrigerators the results of an online survey of a national sample of adults suggest that consumers are on average willing to pay an extra 249 82 349 30 for a refrigerator that has been awarded the energy star label furthermore the results provide evidence that respondent willingness to pay was motivated by both private energy cost savings and public environmental benefits

are the economic costs of non stabilising the atmosphere prohibitive a comment in a recent paper in this journal azar and schneider present carbon abatement costs as a few years delay in an increasing path of welfare and they suggest the adoption of stricter abatement policies to avoid climate change we show that the same argument can be used to derive the opposite conclusion in most studies not only abatement costs but also climate change costs represent a small loss in future welfare the reason for this is the implicit assumption of perfect long term substitutability between man made and environmental goods that many of these models adopt we argue that instead of downplaying the costs of abatement measures we should try to better understand the substitutability possibilities between man made and environmental goods that is the character of long term costs of climate change

introduction to the special issue urban energy governance local actions capacities and politics introduction to a special issue showing how there is much to be gained for deeper understandings of energy policy from a specifically urban analysis of rationales forms and repercussions of energy systems in transition the special issue offers an in depth examination of the variety of urban responses to quite distinctive and sometimes competing energy related challenges

sustainability as intergenerational fairness efficiency uncertainty and numerical methods this paper presents an economic model of sustainability defined as intergenerational fairness assuming that intergenerational fairness is an obligation of each generation a recursive optimization problem is obtained the problem has the advantage that uncertainty can readily be incorporated in the model and it can be solved numerically for a wide range of specifications the possibility of trade offs between efficiency and sustainability are discussed under plausible conditions it is shown that a sustainability obligation is met only if there is the expectation of economic growth

innovation intermediaries accelerating environmental sustainability transitions abstract institutions in the united states are undergoing modifications that present direct challenges for the environment and society and may result in institutional uncertainty and instability this article explores whether innovation intermediaries can be employed as a key component of a strategy to create a window of opportunity for green job creation infrastructure changes and technological innovation in response to these types of institutional modifications based on a systematic literature review this article outlines a framework that combines institutional modifications with technological innovation and infrastructure development as part of an economic development strategy important findings are that connections between innovation intermediaries such as incubator and accelerator centers niche actors such as green champions and regime actors such as policy entrepreneurs show potential to contribute to a green economic development strategy but require further examination for the specific roles played by policy entrepreneurs to help create the conditions for scaling niche experiments and simultaneously disrupting the regime the key contribution is in defining the role of sustainability oriented innovation intermediaries at linking local state and business actions in order to scale up and influence green economic development in a politically feasible manner during times of institutional uncertainty and instability

efficiency sustainability and global warming abstract economic analyses of global warming have typically been grounded in the theory of economic efficiency such analyses may be inappropriate because many of the underlying concerns about climate change are rooted not in efficiency but in the intergenerational allocation of economic endowments a simple economic model is developed which demonstrates that an efficient economy is not necessarily a sustainable economy this result leads directly to questions about the policy relevance of several economic studies of the issue we then consider policy alternatives to address global warming in the context of economies with the dual objectives of efficiency and sustainability with particular attention to carbon based taxes

uncertainty and climate change uncertainty is pervasive in analysis of climate change how should economists allow for this and how have they allowed for it this paper reviews both of

exploring a pioneering bioenergy system the case of enkoping in sweden in order to contribute to knowledge on how to expand bioenergy this paper examines an example of success from sweden the idea is to identify factors that can explain the difference between success and failure of bioenergy systems in the aftermath of the oil crises in the 1970s the local government in the town of enkoping in sweden was cautioned by the local swedish military regiment to shift towards domestic energy supplies rather than imported fossil fuels during the decades that followed the local energy companies developed a pioneering bioenergy system there are 3 important conditions relevant to explain the success 1 the introduction of the carbon tax in sweden provided market conditions making bioenergy sufficiently competitive with fossil fuels 2 the know how developed by the local energy companies through experimentation and collaboration with research institutions encouraged investments in local opportunities and 3 the formation of partnerships in a regional network of actors including private companies providing biofuels and technology research institutions and local government helped to co ordinate the development of the bioenergy system less

exogenous shocks social skill and power urban energy transitions as social fields abstract the constantly growing scholarship on urban energy transitions needs a framework to analyze these transitions this article proposes the field perspective fp as an approach for the study of urban energy transitions fp analyses how the interplay of actors who are dedicated to a similar purpose and the structures guiding this interplay co evolve by applying fp to the energy transition in the german city emden the article shows how the transition evolves through a alterations in the exogenous context of the city e g national feed in tariffs for renewables b the social skill and changing interplay of local actors engaged in the transition and c the emergence of power constellations and rules

consumer preferences for electricity tariffs does proximity matter abstract the introduction of renewable energy sources fosters the transformation to an energy system with distributed generation this alters the relation between consumers and power generation sites as generation and consumption spatially converge it allows for new configurations within the energy sector and provides opportunities for marketing regional energy we empirically investigate consumer preferences for electricity generation in proximity to end users focusing on the proximity of generation and providers and present representative data for germany in a discrete choice experiment a sample of 780 consumer households and 173 adopters of a renewable energy system prosumers chose from a range of different electricity tariffs we estimate the willingness to pay for the following attributes shares of regional generation power providers and electricity mixes we find evidence in favor of regional production but in spite of positive attitudes towards local generation from renewable sources willingness to pay is not responsive to higher shares of regional generation in addition a preference for regional providers exists the results show that renewable energy mixes are preferred particularly a solar and hydro mix adopters state slightly more distinct preferences as compared to consumer households thus we find there is potential for business models offering regionally generated electricity

how high are option values in energy efficiency investments high implicit discount rates in consumers energy efficiency investments have long been a source of controversy in several recent papers hassett and metcalf argue that the uncertainty and irreversibility attendant to such investments and the resulting option value account for this anomalously high implicit discounting using their model and data we show that to the contrary their analysis falls well short of providing an explanation of this pattern

when managers cover their posteriors making the decisions the market wants to see the stock market has opinions as to what choices firms should make we show that concern for current share prices may lead managers to make these choices rather than those suggested by their own superior information even when arbitrarily many privately informed firms have to make a similar decision the market s prejudices may still prevail we compare the distortions that arise from share price maximization with those due to herd behavior among profit maximizing firms and show that the former results in strictly less efficient use of information

a cost benefit analysis of the eu 20 20 2020 package the european commission did not publish a cost benefit analysis for its 2020 climate package this paper fills that gap comparing the marginal costs and benefits of greenhouse gas emission reduction the uncertainty about the marginal costs of climate change is large and skewed and estimates partly reflect ethical choices e g the discount rate the 2010 carbon price in the eu emissions trading system can readily be justified by a cost benefit analysis emission reduction is not expensive provided that policy is well designed a condition not met by planned eu policy it is probably twice as expensive as needed costing one in ten years of economic growth the eu targets for 2020 are unlikely to meet the benefit cost test for a standard discount rate 3 pure rate of time preference the benefit cost ratio is rather poor 1 30 so that benefits need to be very much higher or costs very much lower than typically assumed to justify the 2020 targets only a very low discount rate 0 prtp would justify the 20 emission reduction target for 2020

global warming endogenous risk and irreversibility this paper develops two period analytical and numerical models to study the question given a stock of greenhouse gases that poses a risk of future damages of unknown magnitude and the possibility of learning about damages how do sunk abatement capital and a nondegradable stock of greenhouse gases affect optimal first period investment we show that both affect investment the former negatively and the latter positively additionally endogenous risk the risk of damages dependent on the stock of gases results in an increase in optimal investment for any level of capital sunkness or greenhouse gas degradability quantitatively the effect of sunk capital is stronger than the effect of greenhouse gas irreversibility or that of endogenous risk

good for the economy an ecological economics approach to analyzing alberta s bitumen industry abstract competing claims about the economic social and environmental impacts of bitumen projects make alberta s oilsands industry highly contentious this paper uses a case study of a major bitumen project shell canada s jackpine mine expansion to examine the evidence considered by government decision makers in the project approval process the project was determined to be in the public interest based primarily on its economic benefits despite significant adverse environmental and social impacts the paper evaluates the evidence that was presented to support this decision using three criteria drawn from ecological economics efficient allocation just distribution and sustainable macroeconomic scale it finds that the evidence presented is in fact insufficient to justify the project on any of the three criteria furthermore other studies of the bitumen industry cast doubt on the likelihood that the project would satisfy these criteria if further analysis were conducted it concludes by recommending several measures that could help to improve decision making on bitumen projects in the future

evolutionary policies for sustainable development adaptive flexibility and risk minimising abstract an evolutionary perspective on policies to foster sustainable development is presented it is argued that policies suggested by the traditional economic theory of environmental policy can stimulate unsustainable socio economic structures and patterns in addition they are unable to remove undesired locked in systems and technologies drawing on evolutionary thinking characterised by diversity selection innovation path dependence and bounded rationality an alternative partly complementary theory of environmental policy is suggested specific attention is given to the role of strategies that are aimed at increasing diversity and adaptive flexibility and at reducing risk

an overlapping generations model of climate economy interactions a numerically calibrated overlapping generations model of climate change and the world economy is examined in this paper in the absence of intergenerational transfers efficient rates of greenhouse gas emissions abatement rise from 16 in the present to 25 in the long run while mean global temperature increases by 7 40c relative to the preindustrial norm a utilitarian optimum which attaches equal weight to each generation s life cycle utility yields abatement rates that rise from 48 to 89 with a long run temperature increase of 3 40c a second best utilitarian path in which intergenerational transfers are by assumption institutionally infeasible also supports stringent abatement measures i introduction the infinitely lived agent framework pioneered by frank ramsey 1928 has emerged as a central structure in the economics of climate change as characterized by ipcc 1996 working group iii climate change occurs when anthropogenic emissions of greenhouse gases principally carbon dioxide but also chlorofluorocarbons methane nitrous oxide and water vapor contribute to long term increases in mean global temperature potentially disrupting ecological systems and climate dependent production activities the best known study on the economics of this subject is nordhaus 1994 dynamic model of climate and the economy dice which incorporates assumptions regarding the costs and benefits of greenhouse gas emissions in a standard one sector growth model in nordhaus analysis a 50 reduction in greenhouse gas emissions would reduce gross world output by 0 93 a doubling of greenhouse gas concentrations relative to the preindustrial norm which is expected to occur by the middle of the twenty first century would reduce output by

are the economic costs of non stabilizing the atmosphere prohibitive a response to gerlagh and papyrakis co rr ec te d pr oo f news views are the economic costs of non stabilizing the atmosphere prohibitive a response to gerlagh and papyrakis christian azar stephen h schneider b a department of physical resource theory chalmers university of technology goteborg university 412 96 gothenburg sweden b department of biological sciences stanford university 371 serra mall stanford ca 94305 5020 usa received 10 june 2003 accepted 11 june 2003

scientific progress and irreversibility an economic interpretation of the precautionary principle abstract we consider the problem of the optimal use of a good whose consumption can produce damages in the future scientific progress is made over time that provides information on the distribution of the intensity of damages we show that this progress induces earlier prevention effort only if prudence is larger than twice absolute risk aversion this paper thus identifies the class of quite restrictive but plausible conditions such that scientific uncertainties justify an immediate reduction of the consumption of a potentially toxic substance

targets for global climate policy an overview a survey of the economic impact of climate change and the marginal damage costs shows that carbon dioxide emissions are a negative externality the estimated pigou tax and its growth rate are too low to justify the climate policy targets set by political leaders a lower discount rate or greater concern for the global distribution of income would justify more stringent climate policy but would imply an overhaul of other public policies catastrophic risk justifies more stringent climate policy but only to a limited extent

lobbying the energiewende assessing the effectiveness of strategies to promote the renewable energy business in germany abstract the article examines the influence of renewable energy companies on the decision making process related to the german energy transition it identifies clusters of different lobbying activities and styles through in depth interviews with 20 stakeholders from policy making and business the research used repertory grid technique in combination with homals multivariate analysis its main findings are first although the big four electric utilities operating on the german energy market still possess wide influence companies of renewable energy have developed from a niche into important players of the energy regime second lobbies by the renewable energy sector are mainly aimed at the legislative framework particularly on the renewable energy sources act and the feed in system third interviewees identified 36 different lobby activities the most effective ones are regular and personal maintenance of contact to politicians lobbying within an association knowledge development with correct information and top down contacting of most powerful politicians fourth the statistical analysis reveals clear distinctions between companies with regards to their lobby strategies which are evaluated differently by stakeholders finally the article concludes that companies have a strong influence on political decision making and together with governmental actors form a policy network that strongly shapes the german energy transition

a quantitative minimax regret approach to climate change does discounting still matter abstract using cost benefit analysis to determine an optimal climate mitigation target is criticised especially because i it fails to sufficiently take into account low probability high impact events and ii results strongly depend on the discount rate used one of the alternative suggestions to inform policymakers about the right mitigation target that does take the risks associated with low probability high impact events explicitly into account is the minimax regret criterion we apply the minimax regret criterion quantitatively using an integrated assessment model with extreme values for climate sensitivity damage estimates and mitigation costs the goal is to analyse whether such a method leads to different results compared to standard cost benefit analysis and whether the results are still sensitive to the discount rate used we find that the minimax regret approach leads to more stringent and robust climate targets for relatively low discount rates and if both a high climate sensitivity and high damage estimates are assumed if one of these assumptions does not hold the difference between the minimax regret approach and standard cost benefit analysis is much smaller therefore we conclude that the discount rate used can still be of vital importance even when applying a minimax regret approach

specifications of social welfare in economic studies of climate policy overview of criteria and related policy insights an important assumption in economic studies of climate policy is the social welfare function this paper shows that applying distinct decision or social welfare criteria can result in different optimal policies of climate control notably if climate change impacts are uncertain first decision criteria in current climate economic studies are reviewed next the most important alternatives are discussed including their mathematical formalization and incorporation in economy climate models most of these alternative criteria suggest more stringent climate policies to be optimal than the standard discounted utilitarianism approach however several important welfare criteria have not or hardly seen any application in the economic analysis of climate policy we conclude that there is clear need for systematic research on this theme for which the current review provides a solid basis

the intermediary organisation of low carbon cities a comparative analysis of transitions in greater london and greater manchester making a low carbon economic future for the uk has been declared a key priority by both the previous labour government and also the current coalition government yet there is a large gap between th

a regional dynamic general equilibrium model of alternative climate change strategies outcomes and noncooperative equilibria this study finds that cooperative policies show much higher levels of emissions reductions than do noncooperative strategies that there are substantial differences in the levels of controls in both the cooperative and the noncooperative policies among different countries and that high income countries may be the major losers from cooperation jel h41 q4 q2 q20

emerging in between the multi level governance of renewable energy in the english regions abstract analysis explains the emergence of a regional dimension to the multi level governance of renewable energy in england the case sits in a tense yet informative position between the two poles of ordered and messy multi level governance these tensions which are currently debilitating could be rendered more creative and fruitful if greater authority was devolved to the regions and if policy learning between the regions and the central government was institutionalised more deeply improved legitimacy and accountability mechanisms must accompany increased authority however english ambivalence over regionalisation generally means such changes are unlikely