This book covers various aspects of sustainability, including green economy, green energy, and waste management. It offers analysis of key challenges in contemporary world, as well as concepts and solutions that can be implemented to deal with them. The authors represent various universities located all over the Europe; hence, their perspectives are different and confronting their points of view will result in holistic review of current topics connected with circular economy. The book can be interesting for academics, as it presents the latest research results, for business practitioners, as it supplements research with case studies and real-life examples, and for students, who can learn about new challenges solutions they will have to deal with in their professional careers.