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4 Energy for All: A System Which Can Be Controlled? Before the oil crises of the 1970s, world energy consumption was growing faster than the Earth’s population. The individual average consumption grew as technical progress spread globally. Due to adjustments in the price of oil, followed by parallel evolutions in the price of all forms of energy, a phase out has been observed in certain important sector activities. , a 20% reduction. 11). But there are huge differences between various countries and communities.

In the past several decades our civilisation has witnessed changes which have brought our long-term prospects into question. Non-recyclable fossil fuel is an exhaustible natural resource that will one day no longer be available. As they are our main source of energy it is of common interest to learn how long these fossil fuel resources will be available. This question has attracted the attention of a number of distinguished authorities attempting to forecast the energy future of our planet. 2 Sustainability Concept for Energy, Water and Environment Systems 33 Fig.

The entire set of feasible combinations of social, economic and ecological states describes the temporal transformation space of the economy in the broadest sense. Complexity is the property that describes the state of a complex system [1, 2]. It is a multi-criteria indicator that comprises all the individual characteristics of the sys- 2 Sustainability Concept for Energy, Water and Environment Systems 27 tem. A complex system is an entity that characterises a structure with a large number of interacting elements.

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