This book covers an overview of Environmental life cycle Assessment, methodology and selected case studies from the Agri-food sector and construction Material manufacturing. In the introductory section, an overview is given in environmental pollution, climate change and Paris agreement and how Life cycle thinking assists to eradicate Environmental issues. Chapters have been allocated to LCA methodology, Fieldwork guidance and how to prepare Life Cycle Inventory and selected case studies. This book is recommended for the engineering and science undergraduates who are into Environment Management and Sustainable Engineering Degree Programmes and practitioners.