Blockchain has significant scalability potential in carbon emissions tracking. Its decentralized, transparent ledger ensures secure, tamper-proof data, enabling accurate emissions recording across supply chains. Smart contracts automate verification and reporting, reducing costs and errors. Scalability is supported by integrating IoT devices for real-time data collection and layer-2 solutions to handle high transaction volumes efficiently. For instance, blockchain platforms like IBM’s Hyperledger have been piloted in carbon markets, proving feasibility. However, challenges like energy-intensive consensus mechanisms (e.g., Proof of Work) and interoperability between blockchains must be addressed to ensure sustainability and widespread adoption. With advancements in energy-efficient protocols and standardized frameworks, blockchain can transform carbon tracking globally.