Traditional waste management practices—such as open dumping, landfilling, and incineration—may offer short-term logistical convenience and cost efficiency, but they remain ecologically unsustainable and socially inequitable. These linear approaches have contributed to long-term environmental degradation, public health risks, and resource inefficiencies. In the face of mounting pressure on global waste infrastructures, a paradigmatic shift is emerging: from linear to circular, from centralized to decentralized, and from manual to data-driven systems. This chapter critically interrogates traditional waste disposal models’ environmental and systemic shortcomings, situating them within broader debates on environmental justice and sustainable management. Based on case-based analysis, it underscores the urgency of integrated governance approaches combining technological innovation, coherent policy, and active public participation. Particular attention is given to emerging alternatives such as waste-to-energy (WTE) conversion, innovative recycling technologies, and decentralized waste management (DWM) systems—each offering scalable pathways to close material loops and reduce ecological footprints, according to the fact that, crucially, successful sustainable waste management depends not on isolated advancements but on the co-evolution of enabling policies, technological capacity, public engagement, and institutional coordination. These elements function as interconnected, mutually reinforcing mechanisms essential for developing resilient and context-sensitive waste governance frameworks capable of addressing 21st-century challenges.