Engineering Circular Cities: Comparative Analysis of Waste-to-Energy and Upcycling Models in the United States and Emerging Economies

The transition toward circular economy models in urban waste management represents a critical paradigm shift for sustainable city development. This comparative analysis examines waste-to-energy and upcycling models implemented across the United States and emerging economies, evaluating their effectiveness in engineering circular cities. Through systematic analysis of policy frameworks, technological adoption, and implementation outcomes, this study reveals significant disparities in approach and achievement between developed and developing contexts. The United States demonstrates advanced technological integration and regulatory frameworks, while emerging economies show innovative community-based solutions and adaptive strategies despite resource constraints. The findings suggest that successful circular city engineering requires context-specific approaches that balance technological advancement with socioeconomic realities, emphasizing the need for hybrid models that combine the strengths of both systems.