"To understand what we should do with water, we must first understand how it is used. You can't properly manage what you don't measure." This is how Maite Aldaya, a consultant with the United Nations Environment Programme, explained it during her lecture students in the Master's Degree Biodiversity, Landscapes, and management at the School of Science at the University of Navarra.

In his exhibition, he spoke about the water footprint, an indicator of the efficiency and sustainability of water use and management that reflects the appropriation of water resources by human beings. "This includes three components, the blue water footprint, which refers to the consumption of surface and groundwater; the green, that of rainwater consumption; and the gray, which takes into account pollution and is defined as the freshwater required to assimilate a load of pollutants," he clarified.

According to the expert, as consumers"we should know the data water use of households and consumer products because the decisions of someone in Pamplona affect not only the ecosystems of Navarre but also other countries from which their products come". In this sense, an indicator such as the water footprint provides a deeper vision, "it does not tell us what we should do, but rather financial aid us to understand what could be done".