Biodegradable Plastics: Are They Truly Eco-Friendly?
Plastic pollution has become one of the most overwhelming environmental issues in the world, as plastic waste fills both landfills and oceans, taking centuries to decompose. To try to solve the problem of “biodegradable plastics”, they are quite often advertised as eco-friendly materials that just disappear after using it. But is that true? Although they sound like an ideal alternative to plastic, many biodegradable plastics only decompose under certain industrial conditions, besides harming the environment when thrown away incorrectly. This article explores whether biodegradable plastics genuinely are sustainable, or whether it’s just another green label making us feel better about the problem without actually tackling it.
In an article, ‘Roadmap to Biodegradable Plastics: Current State and Direction Needs’, by ACS Publications, it explains the difference between biodegradable and compostable plastics, and it shows that to decompose these plastics, most require industrial composting conditions to actually break down. And it warns that misleading labels make consumers think that all such plastics are eco-friendly. In this article, they also note how most biodegradable plastics will not actually decompose naturally in landfills or oceans because they need very specific heat conditions and microbes to break down this plastic. This can then lead to things such as contamination in recycling streams, since these plastics often get mixed with regular plastic as well, and end up ruining the entire batch. Due to all these problems, scientists, along with environmental groups, are calling for global standards and clear labeling so that the consumers who buy these biodegradable plastics know how to dispose of them properly.
In an article by the Royal Society of Chemistry, called ‘Recent Advances in the Biodegradability of Polyhydroxyalkanoates (PHAs)’, it focuses on plastic produced by bacteria that are truly biodegradable in soil, marine water, and compost. However, wide production costs limit their global use. This paper includes how PHAs biodegradable through microbial enzymes, even in cooler and even oxygen poor environments; the cost and limited supply chain of PHAs prevent mass adoption, since making PHAs are 3-5 times more expensive than more common plastics; PHAs are best suitable for medical and agricultural single use items. There are also limited factories that make PHAs which means that the supply can’t match the demand.
In the paper ‘Bioplastics for a circular economy’ from Nature Reviews Materials, they talk about how coral bleaching is increasing due to pollution and oceans heating up. This paper shows how rising sea temperatures stress corals, forcing them to expel their symbiotic algae, which stops them from producing energy, and causes bleaching. Fertilisers and waste entering oceans increase the nutrient levels, which makes the coral produce harmful algae, which blocks sunlight and poisons the coral, causing them to die. The study notes that removing the fish that eat the algae of coral, then lets the algae overgrow on the reefs, which competes against the coral for space, which prevents the coral from recovering. The paper also highlights how sudden temperature spikes cause large bleaching events that the coral can’t adapt to quickly. Overall, the article explains how coral bleaching is increasing because oceans are heating up and pollution is rising. These pressures then weaken the coral’s health, making them more likely to die.
The European Environment Agency has an article called ‘Biodegradable and compostable plastics — challenges and opportunities’ This article includes how there are different types of “eco-friendly” plastics, including biodegradable, compostable, oxo-degradable, and bio-based products. It explains how bio-based plastics aren’t always biodegradable or compostable, and some of these “eco-friendly” plastics are made with fossil fuels. This article answers questions about what happens to these plastics when littered, and if they can be composted at home, and if they can be recycled, providing clarity on common misconceptions and proper disposal methods. This policy oriented report highlights the confusion around biodegradable plastics, pointing out the incorrect labeling, misunderstandings among consumers, and lack of composting infrastructure.
An article from the European Commission called ‘Biobased, biodegradable and compostable plastics’ includes a look at the environmental problems caused by traditional fossil fuel based plastics and it explores if biobased, biodegradable, and compostable plastics are better alternatives. It explains that even though these options can be much more sustainable than common plastic, they still come with their own challenges. This article also outlines the European Commission’s policies on how these plastics should be sourced, labelled, and used as part of the European Green Deal and the EU’s circular economy plans. And how the EU aims to limit misleading “green” marketing by pushing for stricter definitions and labels.
Overall, biodegradable plastic might sound like a simple solution for this huge problem, but research shows that the reality is much more complicated than it seems. While some materials, such as PHAs, can break down naturally, most biodegradable plastics only decompose under specific conditions that many countries don’t have. Misleading labels, and high production costs make all these plastics much less effective than is shown. But, switching them without improving waste systems can even create new problems, like contamination in recycling, or even plastics that still end up polluting ecosystems. In the end, while, yes, biodegradable plastics can help reduce environmental damage, this is only if supported by clear standards, proper disposal methods, and realistic expectations. Without these, the biodegradable plastics are more of a temporary solution.