Abstract
Complexity is the property which describes the state of complex system. It is multidimensional indicator which comprises all individual characteristics of the system. Complex system is the entity which characterizes the structure with a large number of elements interacting among themselves. The main energy resources: fossil fuels, nuclear energy, geothermal energy, hydro-potential and solar energy are essential sources of primary energy. The conversion of primary energy resources in the finale energy is a chain of processes leading to usable form of energy. The electricity can be used to produce hydrogen which may be used as the fuel in the fuel cells. There are many different sources of energy on our planet. Among those sources are wind and solar energy. Conversion of wind and solar energy to electricity and to hydrogen is opening a new venue for the efficient utilization of renewable energy sources. Sustainable development is strategic goal of modern society reflecting contemporary demand for economic, social, political and environmental development. It is of fundamental importance for the world to join this movement and promote future strategy in the economic development based on the vision of sustainability criteria.
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