The worldwide day on Energy efficiency is held yearly on March 05^th. It is the propitious date to THINK on the rational use we do to energy, and act in consequence.

The energy efficiency is plan to be one of the RULES to slow down the climate change and its consequence to sustainable societies, together with the development of renewable energies and a transportation policies less aggressive to the environment.

This does not imply to reduce the QUALITY OF LIFE, neverdless, to obtain the same GOODS and energetic services using less resources. This is compiled by improving processes, cogeneration, recycling, the use of less contaminating products and a smart consume, it means use only the energy really needed.