Seeing the impact of severe weather phenomena, references to new concepts and phrases such as "climate neutrality," "sustainable mobility," and "green transition" are increasingly common in the daily life of the modern citizen. At the end of 2019, the European Union announced the European Green Deal aimed at a pro-environmental shift in all sectors of the economy (energy, mobility, industry, agriculture, construction, protection, and restoration of biodiversity), while the European Climate Law set a binding target of climate neutrality by 2050 and a reduction of greenhouse gas emissions by at least 55% by 2030 at the European level.

In this context, the scientific world, in addition to research and documentation, is called upon to assist in the effort to inform the European citizen by codifying and explaining concepts and terms that are not easily understood. The aim of this book is therefore to highlight and clarify the main new definitions in a clear and coherent way, with a view to a holistic and easier understanding of the change that has already begun to take place - a substantial and multidimensional change at European, national, and individual level, centered on the concept of "sustainability."

The present book seeks to provide the necessary theoretical background for the concept of Sustainability, addressed not only to specialists and lawyers but to every citizen, aiming to equip the reader with the necessary knowledge of the terminology that will shape new values for the human world in the coming decades.