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The sixth-generation (6G) wireless communication networks bring about a revolutionary paradigm in which sustainability and superior connectivity become mutually supportive rather than separate pursuits in system architecture, protocol design, and hardware engineering. This chapter critically converges the sustainability-driven mechanisms into the fabric of 6G technology to make this a regenerative infrastructure from intelligent optimization, the principles of the circular economy, and green communication systems. Techniques-focused, it inspects how energy efficiency is amplified through artificial intelligence (AI)-supported dynamic resource allocation, such as deep Q-learning and reinforcement learning, in real-time bandwidth and power distribution, to the point of quantitative reduction in overall consumption of the network. These are complemented by modular, recyclable transceivers, which use duty-cycling and ambient energy harvesting to augment device life and do without batteries. Additionally, this work explores how lightweight communication protocols and adaptive MAC and transport layers reduce data overhead, latency, and signaling energy expenditure. From a systems application point of view, aspects of 6G in smart cities and precision agriculture are deconstructed to unravel the operationalization of edge intelligence and safe, low-latency infrastructure. On-demand traffic orchestration, environmental monitoring, and urban surveillance become possible with millisecond response times. In agriculture, predictive analysis using AI-oriented simulation and sensor-connected farming boosts yield efficiency with a lower environmental burden. In both domains, blockchain increases transparency in which verified, tamper-evident data flows through energy management systems (EMS) and supply chains. These implementations improve operational results and make technological advancements consistent with international environmental objectives. This chapter aims to achieve a technically sound synthesis of how hardware, software, and algorithmic strata 6G advances bear on energy-aware, resource-efficient communication networks. The scope ranges from efficiency at the architecture level and device-embedded sustainability to application-level deployments across critical infrastructures, stressing the layered integration of AI, machine learning, and distributed ledger technologies. The core advantage is how 6G is presented as the ecological enabler. Providing communication systems that scale in throughput and responsiveness and regenerate environmental value through intelligent adaptation, circular design, and predictive maintenance. As shown by empirical data and comparative metrics, 6G embodies the arrival of a networked future that supports its users, devices, and the planet simultaneously.