Ethan Clarke
Biodegradable and compostable plastics are designed to break down over time, but they differ in how they decompose and the environmental impact of their breakdown process. While compostable plastic is biodegradable, not all biodegradable plastics are compostable. Compostable plastic breaks down into compost, a soil-enriching substance, whereas biodegradable plastic breaks down into smaller molecules, which can include harmful microplastics that can cause environmental damage. The terms biodegradable and compostable are often used misleadingly by companies to market their products as green and environmentally friendly. However, the reality is that these products are not always better for the environment and can even contaminate the recycling stream if not disposed of properly.
| Characteristics | Values |
|---|---|
| Biodegradable plastic | Plastic that can disintegrate into basic elements via a natural process |
| Compostable plastic | Plastic that can disintegrate into compost, a soil conditioning material, under certain conditions |
| Biodegradable plastic products | Products that are labelled "biodegradable" are not necessarily "compostable" |
| Compostable plastic products | Compostable plastic products are always biodegradable |
| Biodegradable plastic disposal | Biodegradable plastic should not be composted at home unless the label specifically mentions it |
| Compostable plastic disposal | Compostable plastic can be composted at home or sent to an industrial composting facility |
| Biodegradable plastic recycling | Biodegradable plastic should not be recycled unless the local waste hauler requests it |
| Compostable plastic recycling | Compostable plastic should not be recycled |
| Biodegradable plastic waste reduction | Biodegradable plastic can play a helpful role in reducing waste |
| Compostable plastic waste reduction | Compostable plastic can play a helpful role in reducing waste |
| Biodegradable plastic environmental impact | Biodegradable plastic may leave behind residues or microplastics that can cause harm |
| Compostable plastic environmental impact | Compostable plastic fully degrades into natural elements, leaving no harmful residues behind |
| Biodegradable plastic marketing | The term "biodegradable" is often used for marketing purposes and includes a time component regarding the length of time it takes for the plastic to degrade |
| Compostable plastic marketing | Compostable plastic is often marketed as "100% sustainable", "Eco-friendly", or "Earth-friendly" |
| Biodegradable plastic legal definitions | The term "biodegradable" lacks strict legal definitions |
| Compostable plastic legal definitions | The term "compostable" lacks strict legal definitions |
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What You'll Learn
Composting biodegradable plastic at home
Firstly, it's crucial to understand the difference between biodegradable and compostable plastic. Biodegradable plastic is defined by its ability to break down completely into substances found in nature within a reasonable timeframe. However, this doesn't always happen in practice, and these plastics can still contribute to environmental damage if they end up as litter. Compostable plastic, on the other hand, is specifically designed and tested to be processed in either home or industrial composting facilities. These facilities enable specific conditions, like temperature and moisture, to turn the plastic into usable soil conditioners.
Now, when it comes to composting at home, always check the labels on the plastic items you want to compost. Look for certifications or labels that specifically say "home compostable" or "suitable for home composting." If it doesn't have these labels, don't compost it at home, as it may not break down properly and could contaminate your compost.
If you do find items that are labelled as suitable for home composting, make sure to follow your local guidelines for composting. Different materials have different requirements for optimal composting. For example, some plastics need specific conditions like temperature, moisture, and time to fully decompose. Ensure that your home composting setup can meet these requirements.
Additionally, be mindful of what other organic waste you're adding to your compost. Certain foods, like meat and dairy products, can attract pests or create unpleasant odours. Try to maintain a balanced compost pile with a mix of green waste (kitchen scraps, grass clippings) and brown waste (dry leaves, wood chips) to ensure proper decomposition.
Finally, remember that composting biodegradable plastic at home is just one part of the solution to the plastic pollution crisis. It's also essential to reduce your overall plastic consumption, reuse plastic items whenever possible, and properly dispose of or recycle plastic waste. By combining these practices, you can make a more significant impact in reducing your environmental footprint.
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The environmental impact of biodegradable plastic
The Benefits of Biodegradable Plastic
Biodegradable plastic is designed to break down completely into substances found in nature within a reasonable timeframe. This is a significant improvement over traditional petroleum-based plastics, which can take tens to hundreds of years to degrade and often end up polluting our oceans and entangling marine life. Biodegradable plastics are often made from bio-based sources like seaweed, sugar beets, or other plants, offering a more sustainable alternative to fossil fuels. They can also play a role in reducing waste, especially in the case of compostable take-out containers that can be processed alongside remaining food residue.
Challenges and Limitations
One of the main challenges with biodegradable plastic is that it does not always break down as intended. Proper waste management is crucial, and without the right recovery systems in place, biodegradable plastic may not fully decompose. Additionally, the term "biodegradable" can be misleading, as it does not necessarily imply "compostable." Compostable plastic undergoes a specific process called composting, where it fully degrades into natural elements without leaving harmful residues. Biodegradable plastic, on the other hand, may leave behind microplastics or residues that can persist in the environment and cause harm.
Misleading Marketing and Lack of Standardization
The terms "biodegradable" and "compostable" lack strict legal definitions, and companies often use them as a marketing strategy without providing clear information on how and where their products will biodegrade. There is currently no certification program in the US for "biodegradable" products, and labels often do not specify the timeframe or conditions required for biodegradation. This confusion can lead to contamination in the recycling stream, as consumers are unsure of how to properly dispose of these materials.
The Bottom Line
While biodegradable and compostable plastics can be part of a solution to the plastic pollution crisis, they are not a silver bullet. To truly address the issue, we must focus on reducing and reusing plastic, as well as transitioning to a circular economy. Proper waste management, clear labeling, and consumer education are essential to ensuring that these materials are used effectively and do not cause unintended environmental harm.
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Biodegradable plastic and recycling
Biodegradable plastic is defined by its ability to break down completely into substances found in nature within a reasonable timeframe. Compostable plastic is also biodegradable, but it is specifically designed and tested to be processed in either home or industrial composting facilities. While biodegradable and compostable plastic can play a helpful role in reducing waste, they are not necessarily good for the environment. This is because they can contaminate the recycling stream and cause environmental damage if they end up as litter.
The production of biodegradable plastics is expected to increase from 1.5 million metric tons to almost 5.3 million in the coming years. This shift is fuelled by the growing demand for "green" products and the assumption that biodegradable and compostable plastics are more sustainable options. However, the reality is not that straightforward. Biodegradable and compostable plastics can be misleadingly marketed as eco-friendly, as there are currently no certification programs in place for "biodegradable" products in the US. These labels often do not specify the environment or timeframe in which the product will biodegrade.
To address this issue, the Federal Trade Commission's "Green Guides" state that it is deceptive to make unqualified degradable claims for items entering the solid waste stream if they do not completely decompose within one year after customary disposal. This means that products labelled as "biodegradable" should be able to completely decompose within a year, regardless of whether they are disposed of in landfills, incinerators, or recycling facilities. However, it's important to note that not all biodegradable plastics are designed to be compostable, and some may only fragment into smaller molecules or microplastics that can still cause harm to the environment.
Compostable plastic, on the other hand, fully degrades into natural elements, leaving no harmful residues behind. It is specifically designed to disintegrate under the conditions achieved during composting, utilizing microorganisms, heat, and humidity to yield carbon dioxide, water, inorganic compounds, and biomass. However, some compostable plastics on the market release a toxin called PFAS, which can be harmful to the environment. Compostable plastics are typically made from renewable resources, such as plant-based materials, and are certified to meet specific compostability standards.
When it comes to recycling, biodegradable and compostable plastics should be handled with care. Biodegradable plastics should not be placed in the recycle bin unless specifically requested by the local waste hauler. This is because they can contaminate the fossil fuel plastic recycling stream. Compostable plastics, on the other hand, can be recycled if they have the appropriate certifications and are accepted by the local recycling program. It is important to check local recycling guidelines and only recycle items that are accepted by the program.
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Biodegradable plastic and the reduction of plastic pollution
Biodegradable plastic is defined by its ability to break down completely into substances found in nature, and within a reasonable timeframe. Compostable plastic, on the other hand, is a type of biodegradable plastic that is specifically designed and tested to be processed in either home or industrial composting facilities. These facilities enable specific conditions, such as temperature and moisture, to turn the plastic into usable soil conditioner.
The demand for biodegradable and compostable plastic is increasing as consumers seek more environmentally friendly options. However, it is important to note that these plastics are not necessarily the most sustainable choice. The production of biodegradable plastics is projected to increase significantly in the coming years, and it is critical to understand how these materials are impacting the environment.
One issue with biodegradable and compostable plastics is that they can be misleadingly marketed as environmentally friendly without strict legal definitions or certifications in place. For example, the term "biodegradable" does not always specify the environment or timeframe in which the product will biodegrade. In addition, while compostable plastic can be beneficial, it requires proper management and specific conditions to break down effectively. If not managed properly, these plastics may not break down as intended and can even contaminate the recycling stream if not disposed of correctly.
To effectively reduce plastic pollution, it is important to focus on reducing and reusing plastic products, rather than solely relying on biodegradable or compostable alternatives. Consumers should be cautious of misleading labels and instead opt for products with trusted certifications or those made from fiber-based materials, which tend to be easier to recycle or compost and cause less harm at the end of their life. Additionally, supporting companies that actively reduce plastic packaging and offer compostable alternatives for specific applications, such as takeout containers, can be beneficial.
In conclusion, while biodegradable and compostable plastics can play a role in reducing waste, they should not be solely relied upon to solve the plastic pollution crisis. To create a more sustainable future, it is essential to prioritize reducing plastic consumption, supporting responsible companies, and making informed choices based on proper certifications and guidelines.
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Biodegradable plastic and the use of fossil fuels
Plastic is a major driver of climate change, and 99% of it is made from fossil fuels. The production of plastic is linked to the extraction and refining of fossil fuels for energy, and the demand for oil and gas influences the amount of plastic produced. Fossil fuel companies are increasingly turning to plastic production as a "Plan B" to maintain profit margins as the world moves away from fossil fuels. As a result, the fossil fuel industry is counting on a dramatic increase in plastic use.
The global annual production of plastic has increased from 2 million metric tons in 1950 to 460 million metric tons in 2019, and it is expected to triple by 2060. The plastic industry in the US alone plans to increase its production capacity by up to 75% by 2022, fuelled by expected increases in demand for disposable plastics. This means that US-manufactured plastics are likely to be exported to developing countries, which may not have adequate waste management services to handle the surge in non-biodegradable solid waste.
Biodegradable and compostable plastics are becoming more common as consumers seek out "green" products. However, these plastics are not necessarily better for the environment. While biodegradable plastic is designed to break down into substances found in nature within a reasonable timeframe, it often doesn't work as intended. Compostable plastic, on the other hand, is designed to be processed in composting facilities that enable specific conditions like temperature and moisture to turn the plastic into usable soil conditioner.
Bio-based plastics are made from plant materials instead of fossil fuels, but they are not inherently biodegradable or compostable. In fact, they can be designed to have the same structural and chemical properties as petroleum-based plastics, lasting just as long in the environment. Less than 40% of bio-based plastics are produced to biodegrade, and they often contain a mix of sources, with only a small percentage of plant-based material.
To truly reduce plastic pollution, we must produce, promote, use, and dispose of less plastic overall. Compostable and biodegradable plastics can play a helpful role in reducing waste, but they are not a panacea. They can contaminate the recycling stream and must be collected and paired with the right recovery systems to be effective.
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Frequently asked questions
Biodegradable plastic is defined by its ability to break down completely into substances found in nature, in a reasonable timeframe. Compostable plastic, on the other hand, is designed to be processed in either home or industrial composting facilities, where specific conditions like temperature and moisture turn the plastic into usable soil conditioner.
Compostable and biodegradable plastic can play a helpful role in reducing waste, but they are not necessarily better for the environment. They can contaminate the recycling stream and are often not managed properly once they become waste, so they may not break down as intended.
It depends on the type of plastic and your local recycling guidelines. If the plastic is labelled as compostable, it should be composted. If your local waste hauler accepts biodegradable plastic, it can be recycled with food or yard waste. Otherwise, it may contaminate the fossil fuel plastic recycling stream.
Check the labels carefully. If a product is labelled "biodegradable", it is not necessarily compostable or recyclable. Compostable plastic will often specify whether it is designed for home or industrial composting. To see whether a product can be recycled in your area, check with your local jurisdiction and/or waste hauler.
