975 resultados para Energy crisis


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Some dynamical properties present in a problem concerning the acceleration of particles in a wave packet are studied. The dynamics of the model is described in terms of a two-dimensional area preserving map. We show that the phase space is mixed in the sense that there are regular and chaotic regions coexisting. We use a connection with the standard map in order to find the position of the first invariant spanning curve which borders the chaotic sea. We find that the position of the first invariant spanning curve increases as a power of the control parameter with the exponent 2/3. The standard deviation of the kinetic energy of an ensemble of initial conditions obeys a power law as a function of time, and saturates after some crossover. Scaling formalism is used in order to characterise the chaotic region close to the transition from integrability to nonintegrability and a relationship between the power law exponents is derived. The formalism can be applied in many different systems with mixed phase space. Then, dissipation is introduced into the model and therefore the property of area preservation is broken, and consequently attractors are observed. We show that after a small change of the dissipation, the chaotic attractor as well as its basin of attraction are destroyed, thus leading the system to experience a boundary crisis. The transient after the crisis follows a power law with exponent -2. (C) 2011 Elsevier Ltd. All rights reserved.

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Measurements of the inelastic photoproduction of charmonium at HERA have ignited a new charmonium crisis. The Color Singlet approach to computing onium production cross sections fits the data for large charmonium energy fraction z, where color octet models fail. This approach is however in qualitative disagreement with a wealth of information that exist on charmonium production by other initial states. We here suggest that the source of the discrepancy between color octet models (whether implemented in the soft color or NRQCD formalism) and data is due to the neglect of non-perturbative effects. Implementing these in a scheme originally developed for Drell-Yan phenomenology, we illustrate how agreement with the data is achieved. © 1999 Elsevier Science B.V. All rights reserved.

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Incluye Bibliografía

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Incluye Bibliografía

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The energy released during a seismic crisis in volcanic areas is strictly related to the physical processes in the volcanic structure. In particular Long Period seismicity, that seems to be related to the oscillation of a fluid-filled crack (Chouet , 1996, Chouet, 2003, McNutt, 2005), can precedes or accompanies an eruption. The present doctoral thesis is focused on the study of the LP seismicity recorded in the Campi Flegrei volcano (Campania, Italy) during the October 2006 crisis. Campi Flegrei Caldera is an active caldera; the combination of an active magmatic system and a dense populated area make the Campi Flegrei a critical volcano. The source dynamic of LP seismicity is thought to be very different from the other kind of seismicity ( Tectonic or Volcano Tectonic): it’s characterized by a time sustained source and a low content in frequency. This features implies that the duration–magnitude, that is commonly used for VT events and sometimes for LPs as well, is unadapted for LP magnitude evaluation. The main goal of this doctoral work was to develop a method for the determination of the magnitude for the LP seismicity; it’s based on the comparison of the energy of VT event and LP event, linking the energy to the VT moment magnitude. So the magnitude of the LP event would be the moment magnitude of a VT event with the same energy of the LP. We applied this method to the LP data-set recorded at Campi Flegrei caldera in 2006, to an LP data-set of Colima volcano recorded in 2005 – 2006 and for an event recorded at Etna volcano. Experimenting this method to lots of waveforms recorded at different volcanoes we tested its easy applicability and consequently its usefulness in the routinely and in the quasi-real time work of a volcanological observatory.

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This research is a secondary analysis of the Qué Sabrosa Vida population-based cross-sectional study of two predominately Mexican American communities located along the Texas-Mexico border in 2000. There were two aims for this research. The first was to determine the relationship between knowledge of exercise and water recommendations, and exercise behavior and water consumption. The second was to determine the relationship between exercise behavior and percentage of energy consumption from beverages. Chi-square analysis revealed the majority of both populations had adequate knowledge about water and exercise recommendations, although significant percentages of the populations (>40%) did not consume water or exercise in adequate amounts. Knowledge was found to be a component of both behaviors, as it was more prevalent in the adults who exercised and consumed water in adequate amounts. Analysis of variance revealed no significant difference between overall beverage calorie percentage and exercise level (all p-values > 0.05); both regions and genders reported ∼18% of total caloric intake from beverages. There was no disproportionate influence of beverage calories on total caloric intake, after controlling for water consumption and independent of exercise behavior. These findings suggest that overall caloric intake, from both foods and beverages, may be the most influential factor to the energy imbalance contributing to the obesity crisis in these Hispanic border populations. ^

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The improvement of energy efficiency in existing buildings is always a challenge due to their particular, and sometimes protected, constructive solutions. New constructive regulations in Spain leave a big undefined gap when a restoration is considered because they were developed for new buildings. However, rehabilitation is considered as an opportunity for many properties because it allows owners to obtain benefits from the use of the buildings. The current financial and housing crisis has turned society point of view to existing buildings and making them more efficient is one of the Spanish government’s aims. The economic viability of a rehabilitation action should take all factors into account: both construction costs and the future operative costs of the building must be considered. Nevertheless, the application of these regulations in Spain is left to the designer’s opinion and always under a subjective point of view. With the research work described in this paper and with the help of some case-studies, the cost of adapting an existing building to the new constructive regulations will be studied and Energetic Efficiency will be evaluated depending on how the investment is recovered. The interest of the research is based on showing how new constructive solutions can achieve higher levels of efficiency in terms of energy, construction and economy and it will demonstrate that Life Cycle Costing analysis can be a mechanism to find the advantages and disadvantages of using these new constructive solutions. Therefore, this paper has the following objectives: analysing constructive solutions in existing buildings - to establish a process for assessing total life cycle costs (LCC) during the planning stages with consideration of future operating costs - to select the most advantageous operating system – To determine the return on investment in terms of construction costs based on new techniques, the achieved energy savings and investment payback periods.

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La Región Metropolitana de Madrid (RMM) ha sufrido una gran transformación urbana en el periodo 1985-2007, en el cual ha crecido la población, ha crecido fuertemente el cuerpo físico, pero sobre todo han crecido su coste y su consumo, lo que supone que se ha vuelto más insostenible. Para tratar de comprender esta evolución asimétrica se ensayan sucesivos modelos que tratan de explicar la transformación de la realidad a través de la articulación de las formas de poder y sus políticas asociadas dentro del contexto local-metropolitano. Si se compara la transformación urbana en el periodo 1985-2007 respecto a la registrada durante el desarrollismo previo al presente periodo democrático, se encuentran similitudes, como el amplio consumo de suelo, pero el modelo desarrollista se inscribe en otras lógicas y tiene otros parámetros de contexto y es congruente ya que las últimas décadas del Régimen Franquista se caracterizan por un importantísimo aumento poblacional que se correspondía con el fuerte crecimiento industrial de la RMM. Esa congruencia relativa se pierde en el periodo estudiado, a pesar de que en 1985, se aprueba el Plan General de Ordenación Urbana de Madrid centrado en la ciudad existente y con un crecimiento contenido, y que puede considerarse un modelo abortado. Tras numerosas transformaciones políticas, económicas, sociales y urbanísticas se llega a una situación opuesta a la prevista en el citado Plan. Más de veinte años después, en 2007, se presentan no solo síntomas de agotamiento del modelo finalmente adoptado, sino su quiebra dramática tanto en su dimensión inmobiliario-financiera como del espacio del bienestar. Es precisamente la supresión de los mecanismos de regulación lo que ha caracterizado la evolución de los modelos urbanos, en correspondencia con la desregulación de las actividades económicas y de los flujos de capital propios del modelo "neoliberal". La actual crisis financiera internacional, en especial en algunos países periféricos europeos como España, ha demostrado cómo las políticas económicas que se han llevado a cabo, fuera de toda regulación, han resultado insostenibles. Pero no se trata solo de una crisis económica. En el caso español, de todas las dimensiones de la crisis, destaca la dimensión urbana, o el auge y caída del ciclo inmobiliario, debido a la urbanización intensiva del territorio en relación con el circuito secundario de la acumulación capitalista, habiendo tenido especial incidencia en algunos territorios como la RMM. En la Región Metropolitana de Madrid la situación actual es de crisis urbana, causada principalmente por el divorcio entre las necesidades y la producción de ciudad, pues no se ha basado el crecimiento en la creación de nuevos hogares, u otras cuestiones demográficas, sino en la acumulación de capital a través del crecimiento de la ciudad. Además, dicho crecimiento está conformado por una expansión urbana descontrolada, con mayores requerimientos energéticos que el modelo compacto y complejo tradicional, lo que unido a la escala de los procesos, supone un sistema urbano progresivamente ineficiente. El caso de la RMM resulta paradigmático, ya que la región ha desempeñado un papel como laboratorio de nuevas formas de gobierno y planificación que han dado un mayor protagonismo al espacio, que ha entrado en las dinámicas centrales principalmente por el apoyo al crecimiento físico, a la vez que han confluido circunstancias específicas, como un nuevo impulso al centralismo, lo que ha potenciado ciertas políticas, como considerar la ciudad como motor de crecimiento económico y de competitividad en el concierto europeo y mundial de ciudades. El estudio del papel de la planificación y sus crisis en la sucesión de los modelos, muestra su función nuclear en la propia constitución de estos —es parte fundamental de su aparato de regulación— y su valor no solo para poder entender el periodo, sino para poder proyectar otro futuro urbano. Este enfoque conduce a establecer la relación del planeamiento con las diferentes crisis económicas en el periodo de estudio lo que permite diferenciar tres momentos de dicha relación: la planificación urbanística austera bajo la influencia de la crisis fordista, la salida de la crisis a través de la imposición de un modelo urbano basado en el sobreproducción de espacio urbano, y la entrada en una crisis inmobiliaria y de financiarización en relación a la adopción de un modelo multidimensionalmente insostenible. El análisis de este periodo es la base para apuntar perspectivas que permitan transformar el gobierno urbano hacia un modelo urbano más deseable, o mejor aún, otros futuros posibles, que se enmarcan dentro de la alternativa principal que supone la sostenibilidad. Madrid's Metropolitan Region (MMR) has undergone a major urban transformation in the period 1985-2007, where the population has grown up, the built environment has grown strongly, but mostly its cost and consumption have grown, which means that it has become unsustainable. To try to understand this evolution successive asymmetric models are tested in order to explain the transformation of reality through the articulation of forms of power and its associated policies in that localmetropolitan context. Comparing the urban transformation in the period 1985-2007 to the existing during developmentalism in the current predemocratic period, both have similarities in terms of land consumption, but the previous developmentalism model is part of another logics and has got other context parameters. It is consistent since the last decades of the Franco Regime was characterized by an important population increase that corresponded to strong industrial growth of the MMR. This relative consistency is lost during the study period, although in 1985, with the approval of the Master Plan of Madrid that was focused on the existing city, with a limited growth, and it may be considered an interrupted model. After numerous political, economic, social and urban changes, there is the opposite situation to that foresight under that Plan. Over twenty years later, in 2007, there are not only signs of exhaustion of the model which was finally adopted, but also its dramatic collapse in both real estate and financial dimension of space as well. The urban transformation under analysis has relaunched the hegemony of the sectors that rule the growth of the Madrid's Metropolitan Region and it is supported by decision making and financing of the different administrations with the passivity of the social stakeholders and citizens. This has meant the removal of regulatory mechanisms that have characterized the evolution of urban models, corresponding to the deregulation of economic activities and capital flows according to "neoliberal" model. The current international financial crisis, especially in some European peripheral countries like Spain, has shown how economic policies that have been carried out, without any regulation, have proven unsustainable. But it is not only an economic crisis. In the Spanish case, of all the dimensions of the crisis, it is the urban dimension that is highlighted, or the rise and fall of real estate cycle, due to intensive urbanization of the territory in relation to the secondary circuit of capital accumulation, having had a particular impact in some territories such as the Madrid's Metropolitan Region. In Madrid's Metropolitan Region there is the current situation of urban crisis, mainly caused by the divorce between needs and the city (space) production, because no growth has been based on creating new homes, or other demographic issues, but in the capital accumulation through growth of the city. Furthermore, this growth is made up of urban sprawl, with higher energy requirements than the traditional compact and complex one, which together with the scale of processes, is increasingly an inefficient urban system. The case of Madrid's Metropolitan Region is paradigmatic, since the region has played a role as a laboratory for new forms of governance and planning have given a greater role to space, which has entered the core dynamics supported mainly by physical growth, while specific circumstances have come together as a new impulse to centralization. This has promoted policies such as considering the city as an engine of economic growth and competitiveness in the international and the European hierarchy of cities. The study of the role of planning and crisis in the succession of models, shows its nuclear role in the constitution of these models is a fundamental part of its regulatory apparatus- and also its value not only to understand the period, but to anticipate to other urban future. This approach leads to establish the relationship of planning with the various crises in the study period, allowing three different moments of that relationship: the austere urban planning under the influence of Fordist crisis, the output of the crisis through imposition of an urban model based on the overproduction of urban space, and entry into a housing crisis and financialisation in relation to the adoption of a multi-dimensionally unsustainable model. The analysis of this period is the basis for targeting prospects that translate urban governance towards a more desirable urban model, or better yet, other possible futures, which are part of the main alternative that is sustainability.

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(Matsukawa and Habeck, 2007) analyse the main instruments for risk mitigation in infrastructure financing with Multilateral Financial Institutions (MFIs). Their review coincided with the global financial crisis of 2007-08, and is highly relevant in current times considering the sovereign debt crisis, the lack of available capital and the increases in bank regulation in Western economies. The current macroeconomic environment has seen a slowdown in the level of finance for infrastructure projects, as they pose a higher credit risk given their requirements for long term investments. The rationale for this work is to look for innovative solutions that are focused on the credit risk mitigation of infrastructure and energy projects whilst optimizing the economic capital allocation for commercial banks. This objective is achieved through risk-sharing with MFIs and looking for capital relief in project finance transactions. This research finds out the answer to the main question: "What is the impact of risk-sharing with MFIs on project finance transactions to increase their efficiency and viability?", and is developed from the perspective of a commercial bank assessing the economic capital used and analysing the relevant variables for it: Probability of Default, Loss Given Default and Recovery Rates, (Altman, 2010). An overview of project finance for the infrastructure and energy sectors in terms of the volume of transactions worldwide is outlined, along with a summary of risk-sharing financing with MFIs. A review of the current regulatory framework beneath risk-sharing in structured finance with MFIs is also analysed. From here, the impact of risk-sharing and the diversification effect in infrastructure and energy projects is assessed, from the perspective of economic capital allocation for a commercial bank. CreditMetrics (J. P. Morgan, 1997) is applied over an existing well diversified portfolio of project finance infrastructure and energy investments, working with the main risk capital measures: economic capital, RAROC, and EVA. The conclusions of this research show that economic capital allocation on a portfolio of project finance along with risk-sharing with MFIs have a huge impact on capital relief whilst increasing performance profitability for commercial banks. There is an outstanding diversification effect due to the portfolio, which is combined with risk mitigation and an improvement in recovery rates through Partial Credit Guarantees issued by MFIs. A stress test scenario analysis is applied to the current assumptions and credit risk model, considering a downgrade in the rating for the commercial bank (lender) and an increase of default in emerging countries, presenting a direct impact on economic capital, through an increase in expected loss and a decrease in performance profitability. Getting capital relief through risk-sharing makes it more viable for commercial banks to finance infrastructure and energy projects, with the beneficial effect of a direct impact of these investments on GDP growth and employment. The main contribution of this work is to promote a strategic economic capital allocation in infrastructure and energy financing through innovative risk-sharing with MFIs and economic pricing to create economic value added for banks, and to allow the financing of more infrastructure and energy projects. This work suggests several topics for further research in relation to issues analysed. (Matsukawa and Habeck, 2007) analizan los principales instrumentos de mitigación de riesgos en las Instituciones Financieras Multilaterales (IFMs) para la financiación de infraestructuras. Su presentación coincidió con el inicio de la crisis financiera en Agosto de 2007, y sus consecuencias persisten en la actualidad, destacando la deuda soberana en economías desarrolladas y los problemas capitalización de los bancos. Este entorno macroeconómico ha ralentizado la financiación de proyectos de infraestructuras. El actual trabajo de investigación tiene su motivación en la búsqueda de soluciones para la financiación de proyectos de infraestructuras y de energía, mitigando los riesgos inherentes, con el objeto de reducir el consumo de capital económico en los bancos financiadores. Este objetivo se alcanza compartiendo el riesgo de la financiación con IFMs, a través de estructuras de risk-sharing. La investigación responde la pregunta: "Cuál es el impacto de risk-sharing con IFMs, en la financiación de proyectos para aumentar su eficiencia y viabilidad?". El trabajo se desarrolla desde el enfoque de un banco comercial, estimando el consumo de capital económico en la financiación de proyectos y analizando las principales variables del riesgo de crédito, Probability of Default, Loss Given Default and Recovery Rates, (Altman, 2010). La investigación presenta las cifras globales de Project Finance en los sectores de infraestructuras y de energía, y analiza el marco regulatorio internacional en relación al consumo de capital económico en la financiación de proyectos en los que participan IFMs. A continuación, el trabajo modeliza una cartera real, bien diversificada, de Project Finance de infraestructuras y de energía, aplicando la metodología CreditMet- rics (J. P. Morgan, 1997). Su objeto es estimar el consumo de capital económico y la rentabilidad de la cartera de proyectos a través del RAROC y EVA. La modelización permite estimar el efecto diversificación y la liberación de capital económico consecuencia del risk-sharing. Los resultados muestran el enorme impacto del efecto diversificación de la cartera, así como de las garantías parciales de las IFMs que mitigan riesgos, mejoran el recovery rate de los proyectos y reducen el consumo de capital económico para el banco comercial, mientras aumentan la rentabilidad, RAROC, y crean valor económico, EVA. En escenarios económicos de inestabilidad, empeoramiento del rating de los bancos, aumentos de default en los proyectos y de correlación en las carteras, hay un impacto directo en el capital económico y en la pérdida de rentabilidad. La liberación de capital económico, como se plantea en la presente investigación, permitirá financiar más proyectos de infraestructuras y de energía, lo que repercutirá en un mayor crecimiento económico y creación de empleo. La principal contribución de este trabajo es promover la gestión activa del capital económico en la financiación de infraestructuras y de proyectos energéticos, a través de estructuras innovadoras de risk-sharing con IFMs y de creación de valor económico en los bancos comerciales, lo que mejoraría su eficiencia y capitalización. La aportación metodológica del trabajo se convierte por su originalidad en una contribución, que sugiere y facilita nuevas líneas de investigación académica en las principales variables del riesgo de crédito que afectan al capital económico en la financiación de proyectos.

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Road traffic is the greatest contributor to the carbon footprint of the transport sector and reducing it has become one of the main targets of sustainable transport policies. An analysis of the main factors influencing greenhouse gas (GHG) emissions is essential for designing new energy- and environmentally efficient strategies for the road transport. This paper addresses this need by (i) identifying factors which influence the carbon footprint, including traffic activity, fuel economy and socioeconomic development; and (ii) proposing a methodological framework which uses Modified Laspeyres Index decomposition to analyze the effect of important drivers on the changes in emissions of road transport in Spain during the period from 1990 to 2010. The results demonstrate that the country׳s economic growth has been closely linked to the rise in GHG emissions. The innovative contribution of this paper is the special analysis of the changes in mobility patterns and GHG emissions during the economic crisis, when, for the first time, Spanish road traffic emissions decreased. The reduction of road transport and improved energy efficiency has been powerful contributors to this decrease, demonstrating the effectiveness of energy-saving measures. On the basis of this analysis, several tailored policy recommendations have been suggested for future implementation.

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El sector energético, en España en particular, y de forma similar en los principales países de Europa, cuenta con una significativa sobrecapacidad de generación, debido al rápido y significativo crecimiento de las energías renovables en los últimos diez años y la reducción de la demanda energética, como consecuencia de la crisis económica. Esta situación ha hecho que las centrales térmicas de generación de electricidad, y en concreto los ciclos combinados de gas, operen con un factor de utilización extremadamente bajo, del orden del 10%. Además de la reducción de ingresos, esto supone para las plantas trabajar continuamente fuera del punto de diseño, provocando una significativa pérdida de rendimiento y mayores costes de explotación. En este escenario, cualquier contribución que ayude a mejorar la eficiencia y la condición de los equipos, es positivamente considerada. La gestión de activos está ganando relevancia como un proceso multidisciplinar e integrado, tal y como refleja la reciente publicación de las normas ISO 55000:2014. Como proceso global e integrado, la gestión de activos requiere el manejo de diversos procesos y grandes volúmenes de información, incluso en tiempo real. Para ello es necesario utilizar tecnologías de la información y aplicaciones de software. Esta tesis desarrolla un concepto integrado de gestión de activos (Integrated Plant Management – IPM) aplicado a centrales de ciclo combinado y una metodología para estimar el beneficio aportado por el mismo. Debido a las incertidumbres asociadas a la estimación del beneficio, se ha optado por un análisis probabilístico coste-beneficio. Así mismo, el análisis cuantitativo se ha completado con una validación cualitativa del beneficio aportado por las tecnologías incorporadas al concepto de gestión integrada de activos, mediante una entrevista realizada a expertos del sector de generación de energía. Los resultados del análisis coste-beneficio son positivos, incluso en el desfavorable escenario con un factor de utilización de sólo el 10% y muy prometedores para factores de utilización por encima del 30%. ABSTRACT The energy sector particularly in Spain, and in a similar way in Europe, has a significant overcapacity due to the big growth of the renewable energies in the last ten years, and it is seriously affected by the demand decrease due to the economic crisis. That situation has forced the thermal plants and in particular, the combined cycles to operate with extremely low annual average capacity factors, very close to 10%. Apart from the incomes reduction, working in out-of-design conditions, means getting a worse performance and higher costs than expected. In this scenario, anything that can be done to improve the efficiency and the equipment condition is positively received. Asset Management, as a multidisciplinary and integrated process, is gaining prominence, reflected in the recent publication of the ISO 55000 series in 2014. Dealing Asset Management as a global, integrated process needs to manage several processes and significant volumes of information, also in real time, that requires information technologies and software applications to support it. This thesis proposes an integrated asset management concept (Integrated Plant Management-IPM) applied to combined cycle power plants and develops a methodology to assess the benefit that it can provide. Due to the difficulties in getting deterministic benefit estimation, a statistical approach has been adopted for the cot-benefit analysis. As well, the quantitative analysis has been completed with a qualitative validation of the technologies included in the IPM and their contribution to key power plant challenges by power generation sector experts. The cost- benefit analysis provides positive results even in the negative scenario of annual average capacity factor close to 10% and is promising for capacity factors over 30%.

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The EU has long assumed leadership in advancing domestic and international climate change policy. While pushing its partners in international negotiations, it has led the way in implementing a host of domestic measures, including a unilateral and legally binding target, an ambitious policy on renewable energy and a strategy for low-carbon technology deployment. The centrepiece of EU policy, however, has been the EU Emissions Trading System (ETS), a cap-and-trade programme launched in 2005. The ETS has been seen as a tool to ensure least-cost abatement, drive EU decarbonisation and develop a global carbon market. After an initial review and revision of the ETS, to come into force in 2013, there was a belief that the new ETS was ‘future-proof’, meaning able to cope with the temporary lack of a global agreement on climate change and individual countries’ emission ceilings. This confidence has been shattered by the simultaneous ‘failure’ of Copenhagen to deliver a clear prospect of a global (top-down) agreement and the economic crisis. The lack of prospects for national caps at the international level has led to a situation whereby many member states hesitate to pursue ambitious climate change policies. In the midst of this, the EU is assessing its options anew. A number of promising areas for international cooperation exist, all centred on the need to ‘raise the ambition level’ of GHG emission reductions, notably in aviation and maritime, short-lived climate pollutions, deforestation, industrial competitiveness and green growth. Public policy issues in the field of technology and its transfer will require more work to identify real areas for cooperation.

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Vulnerability in the EU’s internal energy market has been made starker since the Russia-Ukraine crisis, highlighting specifically the importance of upstream energy linkages. March this year saw the European Council calling for a comprehensive plan to reduce the EU’s energy dependence. The European Commission responded to this call with a communication on Energy Security published on 28 May, in time for another European Council at the end of June, at which a decision is anticipated.

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Political instability in the southern Mediterranean countries have highlighted the unsustainability of their economic models. Widespread economic discontent, and in particular very high youth unemployment, underpinned the Arab Spring uprisings. As the refugee crisis shows, this is also Europe’s problem and Euro-Mediterranean economic cooperation needs to be reviewed. Energy is a key part of the cooperation framework.