Omar Khalid
Plastic has become ubiquitous in our daily lives due to its lightweight, flexible, and sturdy nature. However, the environmental impact of plastic waste is a growing concern, with only about 9% of plastic being recycled globally. To address this issue, there has been a shift towards developing and using more environmentally friendly plastics. These plastics, often referred to as bioplastics or eco-plastics, are derived from renewable biological sources such as plants, instead of traditional petroleum-based raw materials. They aim to reduce pollution, reliance on fossil fuels, and the use of landfill space. While bioplastics offer potential environmental benefits, there are also complexities and trade-offs to consider, such as the proper disposal of biodegradable plastics and the lack of long-term research on their effectiveness.
| Characteristics | Values |
|---|---|
| Type | Bioplastics, also known as eco-plastics |
| Raw Materials | Renewable biological sources such as plants, corn starch, sugarcane, seaweed, sugar beets, or cellulose, instead of traditional petroleum-based plastics |
| Biodegradability | Many bioplastics can decompose naturally under certain conditions, reducing waste in landfills. However, they may not break down as intended if not managed properly. |
| Reduced Carbon Footprint | Lower greenhouse gas emissions compared to fossil fuel-based plastics |
| Recyclability | Cannot be recycled through the same avenues as traditional plastics. Bioplastics are often sent to industrial composting centers, chemical recycling plants, and anaerobic digesters. |
| Energy Consumption | Requires less energy to produce compared to traditional plastics |
| Toxicity | Less toxic than traditional plastics and do not contain bisphenol A (BPA), a hormone disrupter |
| Variety of Types | PLA (Polylactic Acid), PHA (Polyhydroxyalkanoates), and more |
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What You'll Learn
Biodegradable plastics
Bioplastics are a type of biodegradable plastic derived from renewable biological sources such as plants, rather than traditional petroleum-based plastics. They are designed to address environmental concerns associated with conventional plastics, including pollution and reliance on fossil fuels. Bioplastics are made from natural materials like corn starch, sugarcane, or cellulose. Many bioplastics can decompose naturally under certain conditions, reducing waste in landfills.
Bioplastics have a reduced carbon footprint, as their production often results in lower greenhouse gas emissions compared to fossil fuel-based plastics. PLA (Polylactic Acid) is commonly used for packaging, disposable tableware, and 3D printing. It is biodegradable but not easily so. The actual timeframe for landfill conditions is unknown. PHA (Polyhydroxyalkanoates) is produced by microbial fermentation and used in packaging and medical applications.
The biodegradable or "eco-friendly" plastic market hit $3.27 billion in 2019 and is expected to grow 9.4% YoY, effectively doubling by 2027. This growth could be accelerated by legislation and government mandates that restrict the production and usage of virgin plastics, as well as consumer attitudes toward more sustainable alternatives.
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Bioplastics
The term 'bio-based' means that the material or product is (partly) derived from biomass (plants). Biomass used for bioplastics stems from sources such as corn, sugarcane, seaweed, sugar beets, or other plants. Bioplastics can also utilize previously unused waste materials such as straw, woodchips, sawdust, and food waste.
Biodegradation is a chemical process during which microorganisms in the environment convert materials into natural substances such as water, carbon dioxide, and compost. The process of biodegradation depends on the surrounding environmental conditions, such as oxygen levels, UV exposure, and temperature. Biodegradable bioplastics can be recycled through mechanical and chemical recycling, which is often preferred from an environmental standpoint. However, biodegradation is not the only acceptable end-of-life disposal pathway, and biodegradable bioplastics cannot be recycled through the same avenues as traditional plastics.
However, there are also trade-offs to consider. The benefits of bioplastics can have negative agricultural impacts, compete with food production, have unclear end-of-life management, and higher costs. Additionally, the infrastructure for the end-of-life handling of eco-friendly plastics is still in its infancy. While bioplastics are gaining traction, with the market hitting $3.27 billion in 2019 and expected to grow 9.4% year-over-year, it is important to note that they are not a perfect solution to the plastic pollution crisis.
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Fossil fuels vs renewable resources
Fossil fuels are currently the main source of energy across much of the world, including the US. However, this is changing as renewable energy sources become more affordable and accessible. Renewable energy sources, such as solar and wind power, are now being used to replace fossil fuel energy, particularly coal-fired plants, which are being retired at a record pace.
There are several reasons for this shift. Firstly, renewable energy sources have substantially fewer emissions than fossil fuels. Fossil fuels are responsible for high CO2 emissions, whereas renewable energy sources emit about 50g or less of CO2 per kWh over their lifetime. This contributes to the reduction of overall emissions and helps in the fight against climate change.
Secondly, renewable energy sources are generally cheaper to use in the long run. Although they may be expensive to install, sources like solar and wind can produce energy at no additional cost for the duration of their lifetime. On the other hand, fossil fuels incur constant costs due to the need for exploration, extraction, and transportation to power plants.
Thirdly, renewable energy facilities can be deployed more rapidly than fossil fuel plants. Solar and onshore wind farms typically take less than two years to build, whereas gas-fired power plants can take up to four years and often require the construction of additional infrastructure such as gas pipelines.
However, there are some challenges associated with renewable energy sources. One concern is the reliability and consistency of energy supply. Fossil fuels offer a relatively quick demand response and are constantly and instantly accessible, whereas renewable sources may be more intermittent and dependent on factors such as the time of day. Additionally, the practicality of renewable sources depends on the geography of the area and the availability of natural resources.
Another consideration is the environmental impact of the materials and infrastructure required for renewable energy technologies, such as solar panels, wind turbines, and hydropower systems. While these technologies do not emit GHGs, there are environmental costs associated with their construction, installation, and maintenance.
In terms of plastic, there has been a growing market for biodegradable or "eco-friendly" plastic, which is often made from bio-based sources like seaweed, sugar beets, or plants instead of fossil fuels. These biodegradable plastics can be routed to industrial composting centers, chemical recycling plants, and anaerobic digesters for proper disposal. PLA, derived from corn, is one example of a biodegradable plastic that is gaining acceptance due to its reduced environmental impact during production and degradation. However, it is important to note that biodegradable plastics are not a panacea for the plastic pollution crisis, and proper waste management systems are crucial to ensure their effective breakdown.
Overall, the debate around fossil fuels versus renewable resources is multifaceted. While renewable resources offer environmental and economic benefits, there are also challenges and considerations associated with their implementation. As the world transitions towards cleaner energy sources, it is essential to address these challenges and continue innovating to create a greener and healthier planet.
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Environmental impact of recycling
Plastic is a broad term that covers a wide range of materials, some of which are replaceable by more eco-friendly materials, while others are not. Eco-friendly plastic alternatives, such as bio-PET, are often touted as environmentally friendly, but they are very similar to conventional plastics like PET or LDPE.
The concept of "eco-friendly" or "biodegradable" plastics has gained traction, with the market for such plastics hitting $3.27 billion in 2019 and expected to double by 2027. This shift is driven by consumer attitudes, legislation, and government mandates that restrict the production and usage of virgin plastics.
One example of an eco-friendly plastic is PLA, which is derived from corn. PLA uses one-third less energy to produce than traditional plastics, emits 70% fewer greenhouse gases when degrading in landfills, and reduces overall emissions by 25% or more. Biodegradable plastics are also made from non-renewable petroleum with chemical additives that cause them to decompose faster in the presence of light, oxygen, moisture, and/or heat.
While recycling has been proposed as a solution to plastic waste, it has not been very effective due to low global recycling rates, which are estimated to be around 9%. Recycling plastic waste has both positive and negative impacts on the environment. On the positive side, it significantly reduces fossil fuel utilization, power consumption, and landfilling, leading to a decline in greenhouse gas emissions and lower carbon footprints. Reprocessing 1 ton of plastic can save up to approximately 130 million kilojoules of energy.
However, a Greenpeace report highlights that only a small proportion of plastics (around 9%) are recycled, and these recycled plastics often contain higher levels of toxic chemicals, increasing potential harm to humans, animals, and the environment. The report emphasizes that plastics are made with toxic chemicals, and recycling them does not eliminate these toxins. Instead, it multiplies their harmful effects, impacting air, water, food, and human and animal health.
Additionally, the complexity of plastic products, market forces that make virgin plastics cheaper than recycled alternatives, inconsistent global policies, and the challenge of managing plastic waste at the end of its life hinder the effectiveness of plastic recycling.
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Composting facilities
Compostable plastic is a subset of biodegradable plastic and is engineered to fully decompose within a few weeks or months in composting facilities. These facilities enable specific conditions like temperature, humidity, and moisture to turn the plastic into usable soil conditioners.
However, not all compostable plastics are made equal. Some are designed for industrial composting facilities, while others are meant for home composting. Industrial composting facilities use machinery that encourages the best conditions for composting, with bugs and microbes that break down organic matter, releasing heat in the process. These facilities can reach temperatures of 160 degrees Fahrenheit, which is impossible to achieve at home.
In the United States, there are about 200 full-scale food-waste composting plants, but only three-fifths of them accept compostable packaging. This means that only a few cities, like San Francisco, Seattle, and parts of New York, have access to industrial composting facilities that can process compostable plastics.
For those without access to industrial composting facilities, home composting is an option, but it is important to ensure that only certified "home compostable" materials are added to the home compost pile. These materials are designed to break down in specific conditions, and improper management can lead to the same environmental consequences as non-biodegradable plastics.
While compostable plastics offer an alternative to traditional plastics, they also present sustainability challenges. They may have a larger environmental impact than conventional plastics due to the emissions created during the agricultural phase and when they end up in landfills. Additionally, the resources required to grow the crops for compostable plastics could be used to grow food.
Therefore, it is essential to consider the full life cycle of compostable plastics and ensure proper management to reduce their environmental impact. Reducing and reusing plastic remains crucial, and compostable plastics should only be used when they add value and work with the systems that can recover them.
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Frequently asked questions
Eco-friendly plastics are those that carry a small environmental footprint. Eco-friendly plastics come in several different types: recycled petroleum-based plastics, plant-derived (bio) plastics, and miscellaneous.
Bioplastics are a type of eco-friendly plastic made from biological materials, such as plants, instead of fossil fuels. They are designed to reduce the environmental concerns associated with conventional plastics, including pollution and reliance on fossil fuels.
Examples of bioplastics include PLA (derived from corn), PHA (produced by microbial fermentation), and PBS (derived from petroleum).
While biodegradable plastics are designed to break down under specific conditions, they may not always work as intended in practice. Biodegradable plastics must be collected and paired with the right recovery systems to be effective.
You can reduce the risks posed by plastics by reducing your use of plastic, choosing plastic products carefully, and using them safely. Opt for recyclable plastics, such as PETE or HDPE, and avoid PVC, which can leach toxins into food.
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