The source appears to be this report by Quantis: https://quantis-intl.com/wp-content/uploads/2018/03/measuringfashion_globalimpactstudy_full-report_quantis_cwf

The source appears to be this report by Quantis: https://quantis-intl.com/wp-content/uploads/2018/03/measuringfashion_globalimpactstudy_full-report_quantis_cwf_2018a.pdf https://quantis-intl.com/wp-content/uploads/2018/03/measurin... Specifically page 18: «Together the apparel and footwear industries generated between 5 and 10% of global pollution impacts in 2016. Footwear alone represents approximately one-fifth the impact of the apparel industry, about 1.4% of global climate impacts (700 million metric tons CO2eq), while apparel represents 6.7% of global climate impacts (3,290 million metric tons CO2eq). Combined, they account for an estimated 8.1% of global climate impacts (3,990 million metric tons CO2eq).»