Final answer:
Independent verification of sustainability measures is provided by external auditors, government agencies, and industry associations.
Step-by-step explanation:
Independent verification of the validity of sustainability measures is provided by external auditors, government agencies, and industry associations.
External auditors are independent third-party professionals who evaluate a company's financial statements and other financial information to ensure accuracy and compliance with relevant regulations.
Government agencies, such as the Environmental Protection Agency (EPA), may also conduct inspections and audits to verify the sustainability practices of businesses.
Furthermore, industry associations often establish their own sustainability standards and conduct audits to ensure member organizations comply with those standards.