This document discusses the challenges and opportunities of green manufacturing. It first discusses the environmental impacts of manufacturing processes, including greenhouse gas emissions and waste generation. It then defines sustainable manufacturing and green manufacturing. It discusses concepts like closed-loop manufacturing and the evolution of sustainable production paradigms. Motivations for green manufacturing include regulations, efficiency, and resource scarcity. Challenges for China's manufacturing include international green trade barriers and environmental issues. Technological opportunities for sustainable manufacturing include new materials, product and process innovation, and supply chain operations. New employment opportunities may also arise in sustainable manufacturing fields.