This book explores how crowdfunding can effectively promote environmental sustainability and circular economy practices in businesses, emphasizing its role in providing crucial financial resources. The importance of financial resources in businesses represents an essential enabler for implementing and scaling sustainable solutions. The book is composed of six chapters, which analyze some key aspects, such as how crowdfunding has been used to develop circular products, success factors for environmental crowdfunding campaigns, the issue of greenwashing in crowdfunding campaigns. By offering a comprehensive and critical analysis of the main issues at stake, this volume provides valuable insights for scholars and students of sustainable business and green finance. The present work also highlights how crowdfunding can help companies to integrate strategies to improve product environmental performance, engage in environmental marketing, and consider alternative business models. Overall, this book is essential to better understand how innovative funding solutions can overcome financial barriers and foster impactful environmental projects.