Fast growth in blockchain technology has sparked more issues related to environmentally disruptive influence, particularly through high energy consumption methods such as Proof-of-Work. The paper reviews the urgent need for DLTs to find sustainable solutions through research on the energy issues surrounding PoW and PoS protocols. By carrying out this analysis, we pinpoint several important areas in which energy consumption within blockchain systems may be alleviated without loss of security and decentralization. Backed by our discovery of these areas for improvement, several techniques that can help create energy-efficient models are proposed, through better agreement algorithms and flexible protocols for managing energy, resource usage-based on network requirement, modulated with regards to. To validate these methods, we present case studies and simulation results, which demonstrate considerable energy savings in different blockchain configurations. The proposed solutions are scalable, flexible, and provide a clear roadmap to the development of more environmentally friendly blockchain networks that will give developers, architects, and policymakers critical insights into mitigating the environmental impacts of the blockchain.