When the British supermarket chain Tesco Plc first started collecting plastic bags and wrappers from customers to be recycled in March 2021, Caroline Ragueneau was thrilled. She was working as a retail assistant at a Tesco store in southwest England when the first white deposit boxes appeared, promising to turn what’s typically discarded back into something useful. Plastic is a notorious source of pollution: unsightly on land, deadly to marine wildlife. Ragueneau, 56, an enthusiastic environmentalist, proudly told friends about the initiative.