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The following example of energy supply scenario is built under the hypothesis of a demographic scenario assuming a stabilisation of fertility at 2.1 children per woman, namely the highest of the four presented in the demography section.
The main feature in due to the increase in energy productivity, a trend clearly established on a secular basis and accelerated by the energy crisis of the second half of XXth century.
Thus, the evolution of energy consumption per capita, assuming that the global society of 21st century, having the same technical system all over the planet, makes more or less equal the energy consumption per capita, at a level of some 1.3 Tons equivalent fuel (TEP), level which means a strong effort in energy saving for presently developed countries, and moderation in consumption for the developing ones. The global energy scenario escapes to the western world. The main decision makers of 21st century are China and India.
One can see from the maps of avaliable resources in solar and wind how important should be these energies in the long term.
Whatever will be the primary sources, the dominant feature of the future energy system is electricity, which can be provided by all sorts of sources (thermal, hydraulic, solar, wind, waves..). Electricity can also be transformed into fuels for transportation, like hydrogen, and be interconnected world wide.
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