We have now had over a year of the plastic bag charge. Since October 2015, shoppers in England have had to pay 5p for plastic bags at retailers with over 250 employees. Many people can now be seen juggling grocery items on their way home from the shops in a desperate attempt to avoid the levy. But have these super-human feats of contortion been worth the effort? Have they together had an impact on the environment?
We now have the data to answer this question, and the answer is a firm yes. The Marine Conservation Society has already reported a 40% drop between 2015 and 2016 in the number of plastic bags they collected from UK beaches. Official figures suggest a total of six billion single-use plastic bags were avoided in the first six months of the charge. Ministers also announced the charge had already raised £29 million for good causes, with many chains opting to support environmental charities.
The harm of plastic pollution
Plastic bags are, however, just a subset of plastic pollution, which is a major environmental challenge, particularly in marine ecosystems. Bigger pieces of plastic can entrap fish, causing injuries, suffocation, or strangulation. Smaller plastics can be ingested. This harms the creature themselves. Scientists have found evidence of plastic making fish larvae less active, more likely to be eaten by predators, and less likely to thrive. This also has implications further down the food chain: For instance, by eating six oysters you are likely to ingest around 50 microplastic particles.
The scale of the problem is immense: Eight billion tons of plastic waste ends up in the oceans every year. A Greenpeace report for the United Nations Environment Programme (UNEP) found evidence of 267 different marine species affected by plastic pollution. Another study has estimated that around half of marine mammals has either been entangled by or ingested plastic. There is growing evidence that plastic pollution affects freshwater rivers too. Researchers found 8,490 pieces of plastic in the River Thames during a three-month-long observation.
The process of plastic manufacturing contributes to climate change. The Committee on Climate Change reports that the industrial sector in general produces 32% of the UK’s greenhouse gas emissions (including both direct emissions and its share of electricity emissions). The plastics industry makes up 2% of this total. Plastics provide another market for oil, and so help to support global fossil fuel supply chains. Incineration of plastic waste releases carbon dioxide into the atmosphere.
Policies to cut down plastic pollution
In the spirit of Edmund Burke’s “little platoons”, litter-picking groups which collect plastic debris from beaches and coastline can ameliorate the problem. The Marine Conservation Society frequently runs such events. While the impact on the total mass of plastic in the ocean is minimal, the activity gives people a tangible connection to their local environment. This can also help raise awareness of plastic pollution, and in turn change behaviour to encourage people to use less disposable plastic.
Increased recycling rates could also help clean up plastic pollution. Single-use plastic bags have been dramatically reduced. But single-use plastic bottles, for instance, remain a major challenge: The average household recycles just 44% of the 480 plastic bottles it uses each year. Fiscal nudges like landfill taxes can encourage recycling, by ensuring businesses to pay for the effects of plastic waste. Improved and more frequent council recycling services could also cut down on such waste.
Plastic pollution has become a major focus of circular economy studies, which seek to increase resource productivity. As well as harming the environment, single-use plastic is an inefficient use of resources. The Ellen MacArthur Foundation has found that 95% of the economic value of plastic is lost after its first use. This is worth between $80 and $120 billion annually. They call for a rapid scaling up of the global supply chain for reused and recycled plastics, with improved infrastructure for collection, sorting and reprocessing to expand the current market.
Microbeads used in cosmetic products are another area where the Government has acted to cut plastic pollution. Next year, a consultation will be launched on how to ban these entirely. This could have a significant impact: A single shower can release up to 100,000 tiny particles of plastic into the sea, according to the Environmental Audit Committee. Up to 4.1% of all microplastics in the ocean are estimated to derive from microbeads in cosmetics. Some are calling for the ban to be extended to other products containing microbeads, such as washing detergents.
Many of these different levers may be needed if the tide is to be turned on plastic pollution. Scientists found earlier this year that since the Second World War we have manufactured enough plastic to cover the entire earth in cling film. The oceans are some of our most precious environments, which host most of our diverse species and flora. We cannot afford to keep damaging them.
Sam Hall is a researcher at Bright Blue