“We do not inherit the Earth from our ancestors;
we borrow it from our children.
Our duty is to give it back”
This famous proverb fully expresses the importance and attention that we all should put in preserving our precious planet for future generations. The ecological footprint represents the impact of human activity, in terms of production of pollution and exploitation of natural resources, in the entire planet Earth. To date, the equivalent of 1.5 planets is used each year and the United Nations has forecast that, with the current population growth trends, we will largely overcome the equivalent of 2 planets by 2050. If we do not want to compromise the resources available to future generations, governments and institutions around the world must intervene urgently to bring exploitation back within the level of sustainability imposed by the Earth. As part of the climate conference held in Paris in 2015 (COP21), it was shown that 78% of global energy consumption and 60% of CO2 emissions are made by towns and urban centres. In this scenario, the construction of energy-efficient buildings plays a fundamental role in reversing the trend of exploitation of natural resources.