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The current context of economic development requires paying close attention to the energy industry. Since 2022, European countries has been facing specific problems due to energy crises against the background of the geopolitical conflict and the measures provided by European forums in order to reduce dependence on energy imports from Russia. In this context, we aim to define a new model of energy consumption and the function of energy sustainability at the European level, aspects that will lead to highlighting the position of the 27 European member states in the period 2005--2022 in terms of their energy sustainability. The methodology used is based on the study of literature, the consolidation of databases, econometric modelling, and procedures for testing the validity of modelling results. The results of the study are useful to European energy policy decision-makers in view of the necessary adjustments to achieve the objectives of the 2030 and 2050 Agenda. [ABSTRACT FROM AUTHOR]

The market segmentation among local governments under decentralization of China not only directly triggered the "fragmentation" of regional development, but also hindered collaborative actions in environmental governance. This study adopts a new method to calculate regional environmental collaborative governance using a synergy degree model of a complex system, and then it empirically analyzes the impact of Chinese market segmentation. We find that the regional environmental collaborative governance in China shows a growing trend during the period of investigation, but the level is still low. Market segmentation has significantly inhibited the regional collaborative governance of environmental pollution among local governments of China. The effect of market segmentation on the order of personnel input and capital input is significantly negative, while the effect on the order of policy input and organizational input is not significant. In the areas where the air pollution and water pollution are serious, the effect of market segmentation is also significantly negative. The conclusions are helpful to understanding the institutional factors that hinder regional environmental collaborative governance in China more comprehensively, and provide insights for improving the performance of environmental governance. [ABSTRACT FROM AUTHOR]