There was a time when a trip to the supermarket involved a relatively simple transaction. One purchased groceries, the checkout operator placed them in plastic bags, and the customer carried them home. The bags were lightweight, strong, reasonably waterproof and capable of being reused for numerous household purposes. They could serve as rubbish-bin liners, storage bags or containers for miscellaneous items. Eventually, when they were no longer useful, they were discarded.
Today, in the name of environmental salvation, the humble plastic shopping bag has become a political enemy. In South Australia, the restrictions have expanded from lightweight shopping bags to thicker plastic film bags and even plastic-laminated paper bags. Customers who arrive without their own reusable bags may find themselves dependent upon paper alternatives that tear when overloaded, lose strength when wet and are frequently less convenient than the products they replaced.
The obvious question is whether all this inconvenience has produced environmental benefits proportionate to the costs imposed upon consumers.
Plastic pollution is a genuine environmental problem. Discarded bags can harm wildlife, accumulate in waterways and persist for extended periods. Nobody seriously interested in environmental protection should defend littering or irresponsible waste disposal. But acknowledging those problems does not establish that banning an entire category of useful products is necessarily the most effective response.
The difficulty begins with the assumption that paper is automatically environmentally superior to plastic. Paper comes from a renewable biological resource, and untreated paper generally breaks down more readily in the natural environment. Yet paper manufacture requires raw materials, water, energy, chemicals and industrial processing. Paper bags are often heavier than equivalent plastic bags, increasing material and transport requirements. Their environmental performance depends upon how they are manufactured, how often they are reused and how they are ultimately disposed of.
A lightweight plastic bag may require fewer resources to manufacture than a paper alternative. If reused several times, its environmental performance can improve further. Conversely, a paper bag used once and discarded may impose a greater burden in some environmental categories, even while performing better in others, particularly persistent litter and marine pollution.
This is why environmental policy should be based upon full life-cycle assessment rather than the simplistic distinction between supposedly virtuous paper and supposedly wicked plastic.
The same problem appears with paper drinking straws. Anyone who has attempted to drink slowly through one knows the practical shortcomings. Paper straws may soften, lose their shape or become unpleasant to use. They are particularly inconvenient when a drink is consumed over an extended period.
There are also questions about the chemical composition of some alternatives. Research has detected per- and polyfluoroalkyl substances, commonly known as PFAS, in certain paper and other plant-based drinking straws. These findings do not mean that every paper straw is dangerous or that using one necessarily creates a significant health risk. They do, however, demonstrate that replacing plastic with another material does not automatically eliminate chemical or environmental concerns.
The sensible response would be to compare alternatives according to durability, safety, manufacturing impacts, pollution risks and practical usefulness. Instead, political debate too often reduces the matter to a symbolic contest in which eliminating visible plastic is treated as an environmental achievement in itself.
Consider the shopping bag. The traditional plastic bag possessed several practical advantages. It was flexible, relatively strong for its weight, resistant to moisture and easily folded for storage. Many households reused supermarket bags rather than immediately throwing them away.
A paper bag, by contrast, may be satisfactory for light, dry purchases but can be less reliable when carrying heavy groceries, chilled products or items with sharp packaging edges. A bag that splits before reaching the car is not merely an inconvenience. Damaged groceries represent wasted food, wasted money and potentially additional environmental costs.
There was an obvious alternative to prohibition: a deposit-and-refund system.
Australia already has experience with container-deposit schemes. The principle is straightforward. A small amount is charged when a product is purchased, and that amount is returned when the container is brought back for collection. Such arrangements create a financial incentive to recover material rather than discard it.
A comparable approach could have been explored for suitable reusable shopping bags. Customers would pay a refundable deposit, use the bags repeatedly and return them when no longer required. Retailers or collection services could recover the material for recycling or other appropriate processing.
Such a system would not be free of difficulties. Bags would need to be sufficiently durable, hygienic and standardised to make collection worthwhile. The costs of transporting, sorting and recycling them would have to be considered. But these are questions for practical policy design, not reasons to assume that prohibition was the only available response.
The larger political issue concerns the relationship between environmental policy and personal choice. Governments increasingly regulate everyday consumer products on the assumption that officials can identify environmentally preferable behaviour and impose it upon the population. Some regulation is justified where products impose substantial costs upon others through pollution. Yet restrictions should be proportionate, evidence-based and attentive to practical alternatives.
South Australia's expanding single-use plastics legislation provides an example. Restrictions began with straws, cutlery and stirrers in 2021 and subsequently extended to numerous other products. By September 2024, thicker plastic film shopping bags and plastic-laminated paper shopping bags were prohibited from sale or supply, subject to specified exemptions.
The policy is presented as part of a transition towards a cleaner environment. Supporters argue that reducing disposable plastic prevents litter, protects wildlife and encourages durable reusable products. Those are legitimate objectives. The question is whether the particular restrictions achieve them efficiently and whether the burdens placed upon consumers have been adequately considered.
For the Greens, restrictions on disposable plastics are consistent with a broader political philosophy favouring stronger government intervention to reduce environmental harm. Critics, however, can reasonably ask whether the movement sometimes places too much emphasis on conspicuous consumer products while paying insufficient attention to larger environmental pressures.
Population growth provides one example. Australia's Greens advocate an expansive approach to humanitarian migration and family reunion, while rejecting the migration reductions proposed by other major parties. Their policy includes increasing the annual humanitarian intake to 50,000 places.
There is a legitimate environmental question here, quite separate from the nationality or ethnicity of migrants. Every additional resident requires housing, infrastructure, energy, water, transport and consumer goods. Population growth increases aggregate demand for resources, although its precise environmental effects depend upon consumption patterns, technology, urban planning and public policy.
Environmental impact cannot be assessed solely by examining whether an individual carries a plastic shopping bag. Total resource consumption matters as well.
This does not prove that immigration is the principal cause of Australia's waste problems, nor does it mean that environmental policy and humanitarian obligations cannot coexist. But it is reasonable to ask political parties to explain how their population policies relate to their environmental objectives.
A government that imposes increasingly detailed restrictions upon minor consumer products should also be prepared to discuss the much larger determinants of national resource consumption. The relevant considerations include population growth, per-person consumption, industrial production, transport systems and the management of waste.
The plastic bag controversy illustrates the danger of confusing visible political action with comprehensive environmental management. Banning an unpopular product is relatively straightforward. Designing an efficient system that reduces pollution while preserving useful consumer choices is more demanding.
A more practical approach would prioritise preventing litter, encouraging genuinely reusable products, improving waste collection, reducing unnecessary packaging and developing recycling systems that demonstrably work. Deposit incentives could be investigated where they offer advantages over outright prohibition.
Consumers should also be given reliable information about the environmental consequences of competing products. If a paper bag has to be reused several times to offset some of its manufacturing impacts, that should be explained. If a plastic alternative performs better in certain life-cycle categories but worse in litter persistence, consumers should know that too. Environmental policy involves trade-offs. There is no reason to pretend otherwise.
The problem with much contemporary environmental politics is its attraction to simple moral categories. Plastic becomes bad, paper becomes good, and the act of banning one in favour of the other becomes evidence of progress. The complex realities of manufacturing, energy consumption, durability and waste management disappear behind the political symbolism.
The ordinary shopper is left to deal with the practical consequences. A forgotten shopping bag becomes an unexpected expense or an awkward struggle with paper packaging. A drink comes with a straw that may deteriorate before the drink is finished. These may be minor inconveniences individually, but they accumulate, particularly when consumers are given little meaningful choice. The aim of environmental policy should be to reduce genuine harm, not merely to demonstrate political determination through the regulation of everyday life.
Plastic is neither an environmental miracle nor an unqualified evil. It is a family of materials with useful properties and significant disposal problems. Paper likewise has advantages and disadvantages. The sensible question is which material performs best for a particular purpose when all relevant consequences are considered.