4.5 Conclusions
It may be concluded that energy systems can be pursued that are
not only compatible with, but are crucial levers for achieving social, economic,
environmental and security goals, as expressed in Agenda 21. As such, energy can
be an instrument for sustainable development. Such energy systems would be based
on a much more efficient use of energy, an increased use of renewable energy
sources (in particular modernised biomass, wind energy, and solar electric
energy) and a new generation of technologies that make it possible to use both
biomass energy and fossil fuels at high efficiency with low adverse impacts on
the local, regional and global environments. At present, overall trends are not
in this direction and attention must now be turned to an analysis of impediments
to sustainable energy futures that are supportive of sustainable
development.