Blockchain for sustainability by enhancing transparency in supply chains, verifying carbon credits, and promoting responsible consumption. It tracks the origin and lifecycle of products, ensuring ethical sourcing and reducing environmental impact. Smart contracts automate sustainability incentives, while decentralized ledgers enable tamper-proof climate data recording. Projects use blockchain to tokenize carbon offsets and facilitate eco-friendly investments. Nonprofits, governments, and green startups are adopting blockchain for ESG reporting, waste management, and renewable energy trading. By fostering trust and accountability, blockchain plays a vital role in advancing global sustainability goals.