First, this book deals with the concept of entrepreneurship referring the process of identifying, creating, and pursuing opportunities to develop new products, services, or business models. Entrepreneurs are innovative risk-takers who seek to solve problems and meet market demands. In the context of a green transition, entrepreneurs play a crucial role in driving sustainable solutions and green business practices. They are at the forefront of developing and implementing environmentally friendly technologies and CE strategies. Second, the book considers the current technological changes as the advancements and innovations in technology that can significantly impact the way of living, work, and conduct businesses. In the context of a green transition, technological change encompasses the development and adoption of clean technologies, renewable energy sources, resource-efficient processes, new solution for by-products and eco-friendly products. These technological advancements are vital for reducing environmental impacts and achieving a more sustainable economy. Finally, in this book the CE is presented as a relatively new economic model designed to minimize waste and promote the continual use and regeneration of resources. Unlike the traditional linear economy (take-make-dispose), the CE focuses on closing the loop, where products and materials are reused, repaired, remanufactured, and recycled, thus extending their life cycles. This approach aims to create a more sustainable and restorative system that maximizes resource efficiency and reduces environmental harm.