Recycling, an activity once associated with empty milk cartons and hippies, is getting a corporate makeover. Last week, tire giant Continental announced that it will use reprocessed polyester taken from recycled polyethylene terephthalate (PET) bottles in its tire production starting in 2022. The raw materials for the polyester — a type of plastic — traditionally used in tire manufacturing is derived from crude oil and natural gas. Making a complete set of vehicle tires will make use of more than 60 recycled PET bottles. In lab and road testing, tires made with polyester fibers obtained from bottles performed as well as tires made with traditional fibers.