Since 1987, after the work carried out by the Bruntland Commission of the
United Nations, the idea of Sustainable Development, resulting from evolution
and a historical need (Ayala-Carcedo, 2000), has started to be disseminated to a
larger and larger extent through ever wider circles. This in turn has meant – in contrast
to the situation several decades ago where the focus was on the economic and
social problem – that today the problem can only be dealt with from the perspective
of the Sustainable Development, integrating economic, social and ecological
sustainability (Figure 1).