As defined in the report on ``Our Common Future'' prepared by the World Commission on Environment and Development, the Brundtland Commission, in 1987, Sustainable Development is to meet the needs of the present without compromising the ability of future generations to meet their own needs (..., 1987). By striving for sustainable development, we do not follow a natural law or try to be compliant to a given principle. Neither do we follow just a political concept, as sustainable development it is often described. In its broadest sense, sustainable development only makes sense as an ethical principle, as a basis and guidance for the choices we have to make. Adhering to the principle, we make the choice to meet our needs, not just the material ones, without compromising the ability of our kids to meet their own needs, not even knowing what their needs will be. This principle applies not only to the needs of future generations: adhering to the principle, we make the choice to meet our needs without compromising the ability of our contemporaries to meet their needs. In this sense, again the future is now.