Environmental worries are driving growth for the resale industry, which expanded 21 times faster than the retail market in the past three years, per GlobalData research cited by Fortune. Secondhand retailer ThredUp estimates the $24 billion secondhand economy within the next 10 years will grow to be 1.5 times the size of fast fashion retailers like Zara, H&M and Forever 21, which last month filed for bankruptcy protection and this week announced plans to close 200 stores. Almost three fourths (72%) of consumers said they prefer to buy from environmentally friendly brands, while 60% would be more loyal to a brand if it offered a recycling program, per ThredUp's study. Those consumer preferences also align well with Goodwill's efforts to raise money from secondhand sales.