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Marine renewable energies are still at a very incipient stage. Even so, it can be anticipated that if such energies were to be developed, multiple benefits could be achieved in the environmental, social, and economic spheres. However, these benefits are not without possible controversial aspects. This article examines the content and scope of the applicable international law of the sea regarding the use of renewable energy from the seas.

The Black Sea enjoys enormous importance from a number of standpoints: if we consider all the economic, political, social and environmental factors that come together, its strategic nature for the world as a whole, not just Europe, is immediately apparent. In this regard, mention is often made of it serving as a bridge between Europe and Asia since it connects Europe with the Caspian Sea area, Central Asia, the Middle East and, going further, with SouthEast Asia and China. 1 Its strategic nature is also due to its connection with certain wide-ranging threats of This chapter has been written within the framework of the following research projects: "NETwork of experts on the Legal aspects of MARitime SAFEty and security (www.marsafenet.org),

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INTRODUCCIÓN.- I. POSIBLES CAMBIOS A EXPERIMENTAR POR LAS FUENTES DEL DERECHO INTERNACIONAL: A) El ámbito consuetudinario: la marcha imparable de la expresión de ciertas convicciones jurídicas frente a la práctica. B) El ámbito creciente del soft law: la manifestación de intenciones políticas frente a la expresión de compromisos jurídicos. C) Otros cambios normativos previsibles (o los efectos derivados de la incompatibilidad entre normas). D) Probables novedades en el plano de los sujetos creadores de las normas.- II. PERCEPCIÓN SOBRE LA NECESIDAD DEL CRECIMIENTO NORMATIVO DEL DERECHO INTERNACIONAL: A) Observaciones introductorias; B) Observaciones en relación con varios ámbitos materiales: a) El plano de los conceptos jurídicos; b) El Derecho internacional económico; c) El desarme; d) La responsabilidad internacional del Estado; e) La competencia extraterritorial del Estado.- APRECIACIONES FINALES.