Environmental science classes and Earth Day curricula from the late 1980s onward taught that sorting plastic into curbside recycling bins diverts it from landfills and into new products — reinforced by the chasing-arrows symbol printed on nearly every plastic item.

The recycling symbol is everywhere. The three chasing arrows stamped on the bottom of every plastic bottle, bag, and food container have come to mean something simple and reassuring: this material can be recycled; your waste will become something new. The message took hold from the late 1980s onward, accompanied by public information campaigns, school curricula, and municipal curbside programmes. By the 2000s, the belief that recycling solved the plastic problem was nearly universal in wealthy countries.

It was, in significant part, a story the plastics industry promoted to protect its business model.

The chasing-arrows symbol was adopted in 1988 as a resin identification code, a system developed by ASTM International to help sorting facilities identify the type of plastic, not to indicate that it was recyclable. The seven numbered categories (PET, HDPE, PVC, LDPE, PP, PS, and 'other') include several plastics, particularly categories 3 through 7, that have rarely or never been economically recyclable at scale. Yet many municipalities placed all plastics bearing the symbol in their recycling streams, and residents reasonably assumed it was all going somewhere useful.

For decades, much of it was going to China. The world's collected plastic waste was shipped east, where cheap labour made sorting and processing economically viable. In 2018, China implemented its National Sword policy, banning imports of most foreign recyclables. Within months, the flow stopped. Municipalities that had been 'recycling' their plastic discovered they were now burying it in landfills or incinerating it. The infrastructure that had maintained the illusion collapsed almost overnight.

The underlying numbers had been published a year earlier. In 2017, Roland Geyer and colleagues published the first global analysis of all plastic ever produced in Science Advances: of 8.3 billion metric tonnes manufactured since the 1950s, only 9% had ever been recycled. About 12% had been incinerated. The remaining 79% had accumulated in landfills or entered the natural environment. The ocean plastic crisis, the Great Pacific Garbage Patch, microplastics in fish tissue, plastic fragments in Arctic sea ice, is the direct consequence.

Internal industry documents obtained by journalists and researchers showed that plastics producers had understood as early as the 1970s that large-scale plastic recycling was economically impractical, and had funded public recycling messaging anyway. The symbol was not a description of a working system. It was a marketing strategy, one that transferred responsibility for an unmanageable waste problem from manufacturers to individual consumers, and kept it there for four decades.

The consequences of that misdirection are still accumulating. Microplastics — fragments less than five millimetres across, shed from degrading plastic in landfills, waterways, and open environments — have now been detected in human blood, lung tissue, and breast milk. The Great Pacific Garbage Patch, a floating mass of plastic debris estimated to cover an area twice the size of Texas, grew in part because material diverted into recycling streams often ended up in ocean-bound waste streams once export markets collapsed. The symbol that promised renewal became instead a marker of a system that was never built.