IELTS Academic Reading — Practice Test 26

Few environmental ideas enjoy as much public trust as recycling. The looping triangle of arrows stamped on the base of a plastic bottle has become one of the most recognisable symbols in the world, and dropping that bottle into the right bin feels like a small but genuine act of responsibility. Surveys repeatedly find that people believe recycling to be among the most effective things an ordinary household can do for the planet. Kerbside collection schemes now reach hundreds of millions of homes, and the plastics that flow into them are, in the public imagination, on their way to being reborn as new products. It is a reassuring picture. It is also, in important respects, misleading.

The awkward truth is how little plastic is actually recycled. Although figures vary from country to country, most careful estimates suggest that only around nine per cent of all the plastic ever produced has been recycled at all. The rest has been buried in landfill, burned, or has escaped into the wider environment. Even material that is dutifully sorted at home frequently ends up incinerated or dumped, because no viable market exists for it. The gap between what people believe happens to their plastic and what actually happens to it is one of the widest in modern environmental life.

Several stubborn obstacles explain the shortfall. Plastic is not a single substance but a family of chemically distinct polymers, and types that look almost identical cannot be melted down together without ruining the result. Sorting them is slow and costly, and a single dirty container or the wrong kind of lid can contaminate an entire batch, sending it to waste. Above all there is the matter of price. Making plastic from fresh oil and gas is often cheaper than collecting, cleaning and reprocessing the used kind, so recycled material struggles to compete on cost. When the price of oil falls, the economics of recycling collapse with it, and reprocessors that were barely profitable are driven out of business.

There is a further limit that sets plastic apart from other recyclable materials. Glass and aluminium can be melted and remade over and over with almost no loss of quality; a drinks can may return as another can indefinitely. Plastic cannot. Each time it is reprocessed its molecular chains grow shorter and weaker, so the material steadily loses strength and clarity. A bottle is rarely turned back into a bottle; more often it becomes carpet fibre or a park bench — useful objects, but ones that themselves cannot be recycled again. This 'downcycling', as it is known, means that recycling delays the moment when plastic becomes waste rather than preventing it.

Critics argue that this was understood long ago by the very companies that championed recycling. The familiar numbered codes moulded into plastic items — the figures from one to seven inside the arrows — were introduced by the industry itself, and many shoppers have taken them to mean that an item is recyclable when in practice several of those categories are almost never accepted. Internal documents unearthed by journalists suggest that some manufacturers doubted recycling would ever handle plastic at scale even as they promoted it to the public. The charge is that recycling was encouraged less as a solution than as a way of deflecting pressure to produce less plastic in the first place, keeping the focus on the consumer's bin rather than on the factory.

One proposed way out of the impasse is 'chemical recycling', which breaks used plastic down into its basic molecular building blocks so that it can be rebuilt into material as good as new. Its advocates present it as the missing piece that will finally allow plastic to circulate endlessly, and considerable investment has flowed towards it. Sceptics are unconvinced. The processes, they note, are hungry for energy and have so far operated only on a modest scale; some versions amount to little more than burning plastic for fuel under a greener name. Whether chemical recycling can ever be cheap and clean enough to matter, its critics say, remains to be demonstrated, and pinning hopes on it risks excusing continued growth in plastic production.

None of this makes recycling worthless. Reprocessing plastic, where it can be done, still saves energy and keeps material out of landfill, and abandoning the effort would help no one. But the evidence points to a clear order of priorities that recycling, for all its visibility, sits at the bottom of. Using less plastic and reusing what already exists do far more to ease the problem than any amount of sorting after the fact. Recycling is not a myth, but it was oversold — presented as a cure when it was only ever, at best, a partial treatment.

In 1906 the English scientist Francis Galton attended a country fair where visitors were invited to guess the weight of an ox on display, the closest estimate winning a prize. Some eight hundred people, most of them with no special knowledge of livestock, paid their pennies and wrote down a figure. Galton, who had a low opinion of the judgement of ordinary people, collected the tickets afterwards expecting to expose the folly of the crowd. Instead he found something that puzzled him. When he averaged all the guesses, the crowd's collective estimate came to within a single pound of the animal's true weight — closer than the guess of any individual expert present. The episode has since become the founding parable of what is now called the wisdom of crowds: the notion that a large group of people can, under the right conditions, know more than the cleverest person among them.

The mathematics behind the effect is less mysterious than it first appears. Any single guess contains a mixture of signal and error — some genuine information about the ox, plus a personal bias that pushes the estimate too high or too low. Crucially, those biases point in different directions. One person overestimates, another underestimates, and when the figures are pooled the opposing errors tend to cancel one another out, leaving the shared kernel of truth to dominate. The larger and more varied the group, the more completely the random mistakes wash away. What survives the averaging is not the opinion of any one person but a distilled residue that no individual actually held.

This does not happen automatically, and much of the research since Galton has been devoted to spelling out the conditions under which it does. Four are usually singled out. The members of the crowd must be diverse, bringing different scraps of information to the problem. They must judge independently, so that each estimate is genuinely their own. The system must be decentralised, drawing on local and specialised knowledge rather than a single official source. And there must be some means of aggregating the individual judgements into a collective one. Remove any of these and the magic fades. A crowd whose members all think alike, or who defer to the same authority, offers no more than a single opinion repeated many times over.

The most dangerous condition to lose is independence, and it is also the easiest. Human beings are relentlessly social, and we take the behaviour of others as evidence about what is true. Once people begin to watch and copy one another, the errors that ought to cancel out instead reinforce each other. Economists call the result an information cascade: a situation in which individuals, seeing others choose a certain option, abandon their own private information and follow suit, so that a few early choices snowball into a stampede. The same herding instinct that produces speculative bubbles in financial markets and panics on trading floors can turn a potentially wise crowd into a foolish mob. The crowd has not grown less intelligent; it has simply stopped thinking independently, and with independence gone, its collective wisdom evaporates.

Not everyone is persuaded that crowds deserve their reputation, and a rival tradition insists that judgement is best left to the informed few. Its supporters point out that on many questions a handful of genuine experts will comfortably outperform a large but ignorant public, and that averaging nonsense produces only a more confident nonsense. Others question the value of the group discussion that is often proposed as a remedy. Far from correcting individual bias, deliberation among like-minded people can entrench it: a phenomenon known as group polarisation, in which a group, after debating, arrives at a position more extreme than the views its members held to begin with. On this account the crowd is not a source of wisdom to be tapped but a force to be contained, and the proper task is not to consult the many but to protect good individual reasoning from the steady pull of the group.

Between these poles, a more practical strand of work asks how the benefits of collective judgement might be deliberately engineered. Prediction markets, in which people buy and sell contracts that pay out according to future events, have proved strikingly good at forecasting elections and product sales, precisely because they reward independent, well-informed bets and punish wishful thinking. Large organisations now crowdsource solutions to technical problems from strangers around the world, and forecasting tournaments have identified small numbers of 'superforecasters' whose pooled predictions rival those of intelligence analysts. Yet the same channels can be gamed. A market can be manipulated by a determined trader, and an online crowd can be swamped by coordinated campaigns, so the machinery of collective intelligence needs safeguards as much as it needs participants.

What emerges from all this is not a verdict but a set of conditions. Crowds are neither reliably wise nor reliably mad; they are wise or mad according to how they are put together. Where members are diverse, informed and free to reach their own conclusions, and where their judgements are gathered without pressure to conform, the aggregate can be astonishingly accurate. Where those conditions fail, the very same crowd can lurch into folly. The interesting question, then, is no longer whether crowds are wise but how to build the circumstances in which they become so — a matter of design rather than of faith.