Scope 3 GHG emissions are indirect emissions in a company's value chain and can account for the largest portion of its carbon footprint. Measuring and reporting these emissions can be complex, but best practices include engaging with suppliers, investing in data management, using emissions factors, and considering third-party verification. Strategies to reduce Scope 3 emissions include product design, collaboration, innovation, and offsetting. Transparent communication of achievements and challenges is crucial. Addressing Scope 3 emissions is essential for sustainability, reputation, and long-term success.