This publication entitled "Encyclopaedia of Environmentally Sustainable Green Science & Technology" attempts towards creating a holistic understanding of environment and sustainable development in its totality. It defines environment and sustainable development in all its dimensions. The concepts and methodologies of ecology, environment and sustainable development have been discussed in detail. The ecosystem perspective and environmental concept of sustainable development have been highlighted, so has been the environmental methodology. An effort has been made towards defining green science and its manifestations for understanding pollution. The applications of green science and technology have been discussed along with a case of biotechnology. The green technology, and environmental monitoring issues have been given considerable coverage. Select case studies have been made in this regard. Also, case studies of environmental engineering and environmental biotechnology have been incorporated with focus on applications and utilities. Future prospect of environmentally sustainable or green technology in today''s world has been analyzed briefly. Similarly, the principles. tools and techniques of environmental management, with particular reference to environmental disasters. have been covered in detail. Glossary of terms, bibliography and links has been provided to make this publication a user friendly one and to aid readers in further research and analysis.