Emerging technologies such as blockchain and artificial intelligence (AI) can be utilized to promote sustainability and reduce waste in supply chains in several ways:

1. Supply chain transparency: Blockchain can be used to create a tamper-proof record of every transaction in a supply chain, from raw materials to finished products. This can enable greater transparency and accountability, helping to reduce waste and ensure sustainability.
2. Smart contracts: Blockchain can also enable the use of smart contracts, which are self-executing contracts that automatically enforce the terms of an agreement. This can help ensure that suppliers meet sustainability standards and reduce waste in the supply chain.
3. Predictive analytics: AI can be used to analyze large amounts of data from supply chain transactions, enabling companies to identify inefficiencies and areas for improvement. This can help reduce waste and promote sustainability.
4. Product tracking: By using blockchain and AI, companies can track products through every stage of the supply chain, from raw materials to finished goods. This can help reduce waste by enabling more accurate forecasting and reducing excess inventory.
5. Circular economy: Blockchain can be used to create digital marketplaces for the exchange of goods and materials, promoting a circular economy and reducing waste.
6. Carbon footprint tracking: Blockchain and AI can be used to track the carbon footprint of products throughout the supply chain, helping companies to identify areas where they can reduce emissions and promote sustainability.

Overall, emerging technologies such as blockchain and AI can help promote sustainability and reduce waste in supply chains by enabling greater transparency, accountability, and efficiency.