Are Biodegradable Plastics Truly Eco-Friendly? Unpacking the Facts for a Sustainable Future

October 27, 2024 / activist360

Impact Characterization of Biodegradable Plastics
Credit: Piao, Z., Boakye, A. A. A., & Yao, Y. (2024). Environmental impacts of biodegradable microplastics. Nature Chemical Engineering, 1, 661–669.

When you hear the word “biodegradable,” what comes to mind? Many of us assume biodegradable plastics are a perfect solution for reducing plastic pollution. However, these materials have complex environmental impacts that aren’t immediately obvious. While they can help reduce certain types of pollution, they also come with hidden trade-offs, including greenhouse gas emissions that contribute to climate change.

In this article, we’ll dive into the environmental impacts of biodegradable plastics, explain how Life Cycle Impact Assessment (LCIA) helps scientists understand their effects, and offer tips for more eco-friendly choices.

What Are Biodegradable Plastics?

Biodegradable plastics are materials designed to break down in the environment faster than traditional plastics. They are typically made from renewable resources, like corn starch or sugarcane, or from fossil-based sources. Common types include plant-based PLA (polylactic acid) and fossil-based PCL (polycaprolactone).

To fully understand their impact, scientists use a process called Life Cycle Impact Assessment (LCIA). LCIA evaluates a product’s environmental footprint across its entire life cycle—from production to disposal. This is essential for understanding biodegradable plastics’ real impact on our planet, including factors like greenhouse gas emissions, water pollution, and waste management challenges.

Benefits of Biodegradable Plastics in Reducing Microplastic Pollution

One of the most significant benefits of biodegradable plastics is their potential to reduce microplastic pollution. Microplastics are tiny plastic fragments that pollute our oceans, rivers, and even our food and water. Because they don’t easily decompose, they accumulate in ecosystems and can harm wildlife and human health.

Biodegradable plastics offer a promising alternative. When they break down properly, they are less likely to form these harmful microplastics. Scientists assess this potential benefit through a measure in LCIA called aquatic ecotoxicity, which looks at how materials impact aquatic life. Biodegradable plastics typically score lower in aquatic ecotoxicity than traditional plastics because they break down more completely, reducing the risk of long-term pollution.

Think of biodegradable plastics like “biodegradable litter.” If disposed of properly, they disappear without leaving a trace, unlike conventional plastics that break into microplastics and linger in the environment for years.

The schematic diagram of the LCA methodology for biodegradable plastics

Hidden Costs of Biodegradable Plastics: Greenhouse Gas Emissions

While biodegradable plastics can reduce visible pollution, they aren’t without environmental costs. As these plastics break down, particularly in natural environments like rivers or forests, they can release greenhouse gases (GHGs) like methane—a potent contributor to climate change.

Here’s a surprising statistic: when PCL, a common biodegradable plastic, breaks down in a natural setting, it can emit up to 16.3 kilograms of CO₂-equivalent per kilogram of plastic. This emission rate is about 16 times higher than what it would release in an industrial composting facility.

Scientists use Global Warming Potential (GWP) within LCIA to measure how much a material contributes to climate change. For biodegradable plastics, scientists often use dynamic GWP calculations, which track greenhouse gas emissions over time rather than assuming a constant rate. This approach reveals that biodegradable plastics can emit GHGs in bursts as they break down, especially under anaerobic (low-oxygen) conditions in natural environments.

In some scenarios, biodegradable plastics that aren’t properly managed may actually emit more greenhouse gases than traditional plastics.

Role of Waste Management in Reducing Environmental Impact

The environmental impact of biodegradable plastics depends heavily on how they are disposed of. Ideally, they should be processed in industrial composting facilities, where conditions like temperature and oxygen are carefully controlled to allow these plastics to break down quickly and with minimal greenhouse gas emissions.

However, when biodegradable plastics end up in natural environments, such as lakes or soil, they break down under uncontrolled conditions, leading to increased emissions.

Think of biodegradable plastics as “biodegradable litter.” Just as litter remains litter if tossed on the ground, biodegradable plastics can still pollute if not disposed of correctly.

This brings us to the End-of-Life (EoL) Impact stage in LCIA. LCIA considers the full “end-of-life” cycle of a product to evaluate its environmental footprint based on where it ends up. Without the proper disposal infrastructure, biodegradable plastics may add to environmental pollution rather than reduce it.

What the Future Holds for Biodegradable Plastics

As scientists learn more about the impacts of biodegradable plastics, they’re working to design materials that minimize environmental costs. Using tools like LCIA, researchers can adjust physical properties—such as density, degradation rates, and carbon content—so that biodegradable plastics break down with lower greenhouse gas emissions and reduced aquatic toxicity.

LCIA helps scientists make informed design choices that balance eco-friendliness with practicality. For instance, certain plastics might be designed with an optimized Specific Surface Degradation Rate (SSDR), which controls the rate at which they break down in nature. This helps reduce greenhouse gas emissions while ensuring the plastic still decomposes efficiently.

Think of it like a “recipe” for future plastics. Each ingredient—density, degradation rate, carbon content—needs to be carefully balanced to create a plastic that’s both sustainable and functional. Just as a recipe requires precision for the best result, so does the design of biodegradable plastics.

With LCIA as a guide, scientists and manufacturers can develop low-carbon biodegradable plastics that help protect the planet by reducing pollution and managing emissions.

What Can We Do to Make a Difference?

As consumers, we have a role to play in reducing plastic pollution and supporting sustainable materials. Here are some ways we can contribute:

Mindful Consumption: Choose products with minimal packaging and support companies that use sustainable materials.
Proper Disposal: Make sure biodegradable plastics go into the correct waste streams. Check local composting and recycling guidelines to see if your area has facilities for biodegradable plastics.
Spread the Word: Share this information with friends and family. Understanding the pros and cons of biodegradable plastics helps everyone make more informed, eco-friendly choices.

Summing Up

Biodegradable plastics are a promising step toward reducing plastic pollution, but they also come with their own environmental costs, especially when they end up in natural environments. Through Life Cycle Impact Assessment (LCIA), scientists help us understand these trade-offs, from reducing microplastic pollution to the hidden impacts of greenhouse gas emissions.

Ultimately, while biodegradable plastics offer benefits, they are only part of the solution. Proper disposal methods, innovative material design, and mindful consumer choices are essential to building a sustainable future for our planet.

Source: Piao, Z., Boakye, A. A. A., & Yao, Y. (2024). Environmental impacts of biodegradable microplastics. Nature Chemical Engineering, 1, 661–669. https://doi.org/10.1038/s44286-024-00127-0

Understanding the Global Plastic Pollution Crisis

September 8, 2024 / activist360

Overview of Plastic Pollution and the Role of the Global Plastics Treaty

Plastic pollution is one of the biggest challenges our world faces today. It affects our oceans, rivers, land, and even the air we breathe. Every year, millions of tons of plastic waste end up in the environment, creating serious problems for both people and nature. Let’s dive into the key facts about plastic pollution and the steps being taken to address it through the Global Plastics Treaty.

What is Plastic Pollution?

Plastic pollution happens when plastic waste escapes from managed systems like landfills and enters the environment. When this waste is no longer controlled, it becomes a major threat to ecosystems. Plastic pollution can be broken down into two types:

Macroplastics: These are larger pieces of plastic (greater than 5mm) like bottles, bags, and other visible plastic items.
Microplastics: Tiny plastic particles (smaller than 5mm) that often come from the breakdown of larger plastics.

How Much Plastic Waste is There?

In 2020, around 52.1 million metric tons of macroplastic waste entered the unmanaged environment. This is about 21% of all the plastic waste produced by cities and towns, also known as municipal plastic waste. Municipal plastic waste comes from homes, businesses, schools, and public spaces, according to a global emissions inventory study published in Nature (s41586-024-07758-6).

What is the Unmanaged Environment?

The “unmanaged environment” is any place where plastic waste is no longer being controlled. This includes uncollected waste, litter, and open dumping sites. Once plastic enters this environment, it can move freely and cause harm to wildlife, ecosystems, and even human health.

Why Does Open Burning Happen?

In many parts of the world, especially in developing countries, formal waste collection services are either unavailable or not sufficient. As a result, people resort to open burning of plastic waste as a way to get rid of it. Open burning is harmful because it releases dangerous chemicals into the air and contributes significantly to pollution.

Global North vs. Global South: Who’s Responsible?

When we talk about plastic pollution, the world is often divided into the Global North and the Global South:

The Global North includes wealthier, high-income countries like the United States, Western Europe, and Japan. These countries have better waste management systems and tend to have less uncollected waste.
The Global South includes developing countries in regions like Africa, Latin America, and Southeast Asia. These countries struggle with waste collection, and uncollected plastic waste is a major source of pollution.

Plastic Pollution Hotspots

Certain regions are considered plastic pollution hotspots due to their high levels of unmanaged plastic waste:

Southern Asia, Sub-Saharan Africa, and Southeast Asia have the highest levels of plastic pollution.
India is the largest global emitter, contributing nearly one-fifth of all plastic waste emissions, followed by countries like Nigeria and Indonesia.
In contrast, the Global North has lower levels of pollution because of better waste management practices, though littering is still a problem.

What is the Global Plastics Treaty?

The Global Plastics Treaty is a global agreement being negotiated under the United Nations Environment Programme (UNEP) to tackle plastic pollution. The treaty aims to reduce plastic waste, improve recycling, and promote better waste management worldwide. This treaty brings together representatives from governments, industries, scientists, and environmental groups to find solutions.

Negotiations began in 2023. The next Intergovernmental Negotiating Committee (INC) meeting for the Global Plastics Treaty is scheduled for November 25–December 1, 2024 in Busan, South Korea. This meeting is called INC-5 and is expected to finalize the text of the treaty.

Why Does This Matter?

Plastic pollution has lasting effects on the environment and human health. Once plastic waste enters the environment, it can break down into microplastics, which are even harder to clean up. Without immediate action, plastic waste will continue to harm ecosystems, wildlife, and people.

Call to Action

Plastic pollution is a global issue that needs urgent attention. While some countries have made progress in managing their plastic waste, others face major challenges. The Global Plastics Treaty offers hope for coordinated global action to reduce plastic pollution and protect our planet for future generations. Tackling uncollected waste and improving waste management systems, especially in developing countries, will be key steps toward solving this crisis.

By understanding the sources and impacts of plastic pollution, we can all play a part in making our world a cleaner, healthier place.

The Global Plastic Crisis: Corporate Accountability & Reduction Strategies

April 28, 2024 / activist360

Photo of plastics near trees. Myanmar (Burma). Photo by Stijn Dijkstra, Pexels.

The global plastic pollution crisis, driven by major corporations, has reached alarming levels. The recent study “Global Producer Responsibility for Plastic Pollution,” published in Science Advances, reveals a direct link between corporate plastic production and the branded waste found polluting our planet.

Key Findings of Plastic Pollution and Corporate Influence

The study, conducted over five years (2018-2022) across 84 countries, with particularly robust coverage in Southeast Asia, Africa, Europe, and North America, analyzed over 1,500 brand audits to quantify the sources of plastic pollution. The findings are staggering:

Just 56 companies accounted for over 50% of all branded plastic pollution documented globally.
The top contributors include The Coca-Cola Company at 11%, followed by PepsiCo (5%), Nestlé (3%), Danone (3%), and Altria (2%).
There was a clear linear relationship between a company’s plastic production levels and the amount of its branded plastic pollution found in the environment.
Food and beverage companies producing single-use plastics were disproportionately higher polluters compared to their production volumes.
A startling 50% of the plastic pollution items found were completely unbranded. This highlights the need for improved labeling to identify polluter sources and hold companies responsible.

These results show evidence that major corporations are driving the global plastic crisis through their excessive production of disposable plastic products and packaging. Food and beverage companies, which produce many single-use plastic products, were disproportionately higher polluters relative to their production volumes compared to companies making longer-lasting household and retail products.

There were noticeable gaps in data from regions like South America, central and north Asia, the Middle East, and central Africa.

Strategies for Reducing Corporate Plastic Pollution

To combat global plastic pollution effectively, the study suggests several strategies:

Phase out non-essential single-use plastics: Corporate polluters, especially the largest polluters identified, need to eliminate unnecessary single-use plastic products.
Invest in alternative materials: Develop and utilize safer, sustainable materials.
Implement reuse and refill systems: Promote systems that reduce the need for single-use packaging and promote and alternative materials.
Maintain standards of transparency and accountability: Develop international standards for packaging labeling and branding.

The study also revealed that 50% of plastic pollution items found were completely unbranded, highlighting a critical lack of transparency and traceability. To address this, the researchers recommend the creation of an international, open-access database where companies would be required to report their plastic pollution – from production to waste.

By holding corporations accountable and compelling them to fundamentally shift away from single-use plastics, we can move towards tackling the plastic pollution crisis. This data-driven approach provides a clear roadmap for environmental activists, policymakers, and concerned citizens to demand urgent action from the world’s largest plastic polluters.

The Role of Transparency and Accountability

The study recommends creation of an open-access global database where companies must quantitatively track and report their plastic product and packaging data, as well as releases into the environment.

There is yet no single, comprehensive global database that mandates reporting of all corporate plastic production and waste; however, there are several initiatives that aim to increase transparency and accountability.

The Global Commitment and Plastic Pact Network led by the Ellen MacArthur Foundation requires members to track and report their progress on plastic waste reduction. The Plastic Disclosure Project also encourages companies to voluntarily report their plastic pollution.
The European Union has implemented directives requiring companies to report on packaging and waste.
The Global Plastic Action Partnership also engages stakeholders to shape national action plans on plastic pollution.
Some countries have Extended Producer Responsibility (EPR) legislation, which requires producers to report on production, recycling, and waste management activities.

Mobilizing Stakeholders for Action

The clear link established between corporate plastic production and environmental pollution underscores an urgent need for systemic changes in how plastic products are produced, used, and disposed of. With a significant portion of plastic pollution traceable back to a handful of major corporations, especially those producing single-use plastics, the path forward requires a combined effort of corporate innovation and robust governmental regulation. By focusing on extended producer responsibility and encouraging sustainable alternatives, we can significantly reduce plastic pollution and move towards a more circular economy. It is crucial for governments, corporations, and consumers to work together to implement these changes and preserve our environment for future generations.

No More Excuses

The era of excuses and inaction has ended. We must hold these corporations accountable for their contributions to the plastic pollution crisis.

Source: Cowger, W., Willis, K. A., Bullock, S., Conlon, K., Emmanuel, J., Erdle, L. M., Eriksen, M., Farrelly, T. A., Hardesty, B. D., Kerge, K., Li, N., Li, Y., Liebman, A., Tangri, N., Thiel, M., Villarrubia-Gómez, P., Walker, T. R., & Wang, M. (2024). “Global producer responsibility for plastic pollution.” Science Advances, 10(eadj8275).