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Green building materials have seen significant breakthroughs recently, focusing on sustainability, durability, and energy efficiency. Innovations include bio-based composites derived from agricultural waste, which reduce reliance on traditional cement and plastics. Self-healing concrete, embedded with bacteria or microcapsules that repair cracks autonomously, extends building lifespans and reduces maintenance costs. Phase-change materials (PCMs) are being integrated into walls and roofs to regulate indoor temperatures by absorbing and releasing heat, improving energy efficiency. Additionally, developments in recycled materials such as reclaimed wood, recycled steel, and glass fiber composites contribute to lowering the carbon footprint of construction. Nanomaterials that improve insulation and air purification are also gaining attention. These materials not only reduce greenhouse gas emissions during production but also enhance the overall sustainability of buildings, aligning with global climate goals.