The role of a procurement manager in controlling plastic waste can vary depending on the specific company and industry, but some potential responsibilities could include:

1. Sourcing sustainable and environmentally-friendly materials: The procurement manager can work with suppliers to identify and source materials that are biodegradable or can be recycled, reducing the amount of plastic waste generated by the company.
2. Implementing waste reduction initiatives: The procurement manager can work with other departments to identify areas where plastic waste can be reduced or eliminated, such as switching to reusable containers or packaging materials.
3. Encouraging supplier sustainability: The procurement manager can encourage suppliers to adopt sustainable practices and reduce their own plastic waste generation, by asking about their sustainability policies and practices during the supplier selection process.
4. Monitoring compliance: The procurement manager can monitor compliance with environmental regulations related to plastic waste, and ensure that the company is meeting or exceeding these requirements.
5. Educating employees: The procurement manager can educate employees on the importance of reducing plastic waste, and provide guidance on best practices for reducing plastic waste in their work.

Overall, the procurement manager can play an important role in reducing plastic waste by making sustainable procurement decisions, implementing waste reduction initiatives, and encouraging suppliers and employees to adopt sustainable practices.

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Note: Above views are purely written based on my own individual experience through various industries & based on that above points have been came out. Also gone through various books & Reference sites before conclude. Hence before implementing, pls. review & decide whether it suits/align to your requirements or not.