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The report analyzes the lifecycle emissions of polyester t-shirts to identify decarbonization opportunities for chemical producers and retailers. It argues that defining emissions reduction thresholds at upstream stages, such as the PET resin step rather than the fabric step, is essential to stimulate investment in low-emission chemical production. The analysis categorizes solutions into near-term operational changes (reducing up to 47% of footprints), near-term capital investments (reducing 31%), and long-term innovations (reducing 13-28% or up to 45% with transformative feedstocks). To derisk these capital-intensive transitions, the report suggests aggregated demand from multiple sectors (automotive, healthcare, construction), the formation of buyers alliances, and the implementation of green public procurement, noting that a 10-50% shift in US military procurement for polyester and nylon equipment could represent $100-$500 million in spending.