The development and application of cleaner technologies (environmental technologies) offer multiple benefits for the adopter: reduced emissions, less waste and cost savings from reduced resource use and savings on waste costs. The question here is: if cleaner technologies offer such great benefits why they are diffusing so slowly across the economy? This special issue is about answering this question by presenting a collection of contributions that lay down a good foundation for students, scholars, practitioners and policy makers interested in making sustainable development more than a metaphor. The contributions range from surveys of literature identifying gaps and directions in the field, cleaner technology diffusion case studies, advances in diffusion modeling and diffusion policy issues and recommendations. In general the set of papers present an overview of the advances in the field of cleaner technologies diffusion research.