This book delineates the framework to research and develop new theories and system techniques for a circular economy (CE) strategy to fulfill Sustainable Development Goals (SDGs) in the era of digital, sustainable, and green transformation (DX, SX, and GX). For that purpose, five system techniques are presented here: (1) multi-generational and circular economy value chain management (CE-VCM), (2) cyclical resource supply and resource collection, (3) CE product planning and digital...