Sofia Martinez
Plastic production, use, and disposal emit significant amounts of greenhouse gases, including carbon dioxide. The life-cycle emissions of plastics, including production and disposal, contribute to global warming and are estimated to be responsible for around 3.3% of global emissions. The production stage, involving the conversion of fossil fuels into plastics, accounts for approximately 90% of these emissions. While plastic has advantages in terms of lightweight packaging and reducing food waste, its environmental impact is significant, with plastic waste littering cities, oceans, and the air. Researchers predict that emissions from plastic production and incineration will increase, contributing to global warming and climate change.
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What You'll Learn
Plastic production is expected to almost quadruple by 2050
Plastic production is a significant contributor to global warming. The production of plastic involves converting fossil fuels, which releases carbon dioxide. According to the OECD, the life-cycle emissions of plastics, including production and disposal, were 1.8 billion tons, measured in carbon dioxide equivalents. Most of these emissions come from the production stage, with around 90% attributed to converting fossil fuels into plastics.
The impact of plastic production on climate change is significant. By one estimate, emissions from producing and incinerating plastics could amount to 56 gigatons of carbon between now and 2050, which is almost 50 times the annual emissions of all coal power plants in the US. This prediction is based on the expectation that plastic production will almost quadruple by 2050, according to the World Economic Forum.
The American Chemistry Council notes that the US industry plans to invest $47 billion in new plastics-production capacity over the next decade. This highlights the urgency of addressing the plastic crisis as a climate crisis. To mitigate the environmental impact, systemic shifts are necessary, such as reducing the growth of plastic production and adopting more sustainable practices.
Various approaches to reducing the plastic footprint have been proposed, such as alternative materials, biodegradable plastic, recycling, and the use of zero-carbon energy sources in manufacturing. The intervention analysis estimates a range of global plastic consumption between 594 Mt and 1018 Mt in 2050, depending on increment rates. Implementing reduction targets and recycling targets can significantly decrease plastic use in 2050 compared to 2018.
The Ellen MacArthur Foundation also warns that without significant changes, there will be more waste plastic in the sea than fish by 2050. This underscores the need for urgent action to address plastic consumption and production, with policies and regulations aimed at reducing, reusing, and recycling plastics to curb their environmental impact.
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Plastic refining is greenhouse-gas intensive
Plastic refining is a significant contributor to greenhouse gas emissions. The production and disposal of plastic account for around 3% of global emissions, with most of these emissions stemming from the production stage. This involves converting fossil fuels into plastics, a process that emits carbon dioxide and other greenhouse gases.
The CIEL report highlights the magnitude of the issue, estimating that emissions from plastics production and incineration could amount to 56 gigatons of carbon between the present and 2050. That is nearly 50 times the annual emissions of all coal-powered plants in the US. The report also projects that by 2030, emissions from plastic production and incineration will reach 1.34 gigatons per year, equivalent to the emissions of over 295 new 500-megawatt coal-fired power plants.
The refining of plastics, specifically ethylene, is particularly greenhouse-gas intensive. In 2015, emissions from manufacturing ethylene, the foundational component of polyethylene plastics, ranged from 184.3 to 213 million metric tons of carbon dioxide equivalent. This is projected to increase by 34% between 2015 and 2030, further exacerbating the climate crisis.
To address these emissions, some advocate for the use of bio-based feedstocks and zero-carbon energy sources in the refining and manufacturing stages, respectively. Increasing the percentage of bio-based plastics, produced from plants that absorb CO2 during growth, can help reduce emissions. Additionally, transitioning to renewable energy sources instead of fossil-based energy has been identified as a crucial step in mitigating plastic's greenhouse gas emissions.
While plastic does have a significant carbon footprint, it is important to consider the impact of alternatives. For example, paper bags may require more material and transportation, while glass manufacturing and recycling can lead to higher emissions. However, the focus on alternatives should not detract from the urgent need to reduce plastic production emissions and curb the proliferation of plastic waste in our environment.
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Plastic waste management releases carbon dioxide
Plastic waste management practices such as landfilling, recycling, and incineration all contribute to carbon dioxide emissions. Landfilling emits the least amount of greenhouse gases, but it presents other significant environmental risks. Recycling helps reduce emissions by displacing the need for new virgin plastic, but it still has moderate emissions associated with the process. Incineration, or burning of plastic waste, leads to extremely high carbon dioxide emissions and is a significant environmental concern, particularly in communities of colour and low-income populations, where incineration facilities are often located.
The impact of plastic waste on carbon dioxide emissions extends beyond disposal methods. Plastic waste in oceans and waterways can interfere with the natural process of carbon absorption and sequestration. Microplastics contaminate microscopic plants (phytoplankton) and animals (zooplankton) that play a critical role in capturing carbon at the ocean's surface and transporting it to deeper waters. This contamination can degrade the ocean's capacity to absorb and sequester carbon dioxide, exacerbating the climate crisis.
Additionally, the extraction and transportation of fossil fuels, the building blocks of plastics, are carbon-intensive activities. The CIEL report estimated that extracting and transporting natural gas to create feedstocks for plastics in the United States emitted 12.5 to 13.5 million metric tons of carbon dioxide equivalent annually. Furthermore, the refining and manufacturing stages of plastic production are also greenhouse-gas intensive. For example, emissions from manufacturing ethylene, a key component of polyethylene plastics, were estimated at 184.3 to 213 million metric tons of carbon dioxide equivalent in 2015.
To address the carbon dioxide emissions associated with plastic waste management, a comprehensive strategy is necessary. This includes reducing waste, retaining and refurbishing materials, and recycling. According to the CIEL report, implementing a circular business model could lead to a reduction of 62 million metric tons of carbon dioxide emissions annually. Additionally, using bio-based feedstocks and zero-carbon energy sources in the manufacturing phase can significantly decrease overall emissions.
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Plastic's carbon footprint continues after disposal
Plastic production and disposal emit around 3% of global emissions. However, this figure is predicted to increase as plastic production rises. The World Economic Forum predicts that plastic production will almost quadruple by 2050, and the CIEL report estimates that the cumulative greenhouse gas emissions from plastic production and incineration will reach 56 gigatons of carbon by then, or 10-13% of the total remaining carbon budget.
The production of plastics has substantial environmental, health, and socioeconomic impacts. The carbon and particulate-matter-related health footprint of plastics have doubled since 1995, mainly due to the growth in plastics production in coal-based economies. The strongest increase is expected for coal-based economies such as China, India, and South Africa, while the largest international customers of plastics are the European Union and the United States.
The climate impact of plastic production and disposal is not the only concern. Incineration facilities are often built near communities of color and low-income populations, and burning waste can release thousands of pollutants. Plastic waste also litters cities, oceans, and the air, and can be ingested by marine animals or break down into tiny pieces that contaminate rivers, oceans, and drinking water.
In addition, plastic pollution can interfere with the ocean's capacity to absorb and sequester carbon dioxide. The Earth's oceans have absorbed 20-40% of all anthropogenic carbon emitted since the industrial era. Microplastics can also reduce the growth of microalgae and the efficiency of photosynthesis, which could degrade plankton's ability to remove carbon dioxide from the atmosphere. Laboratory experiments suggest that plastic pollution can reduce the metabolic rates, reproductive success, and survival of zooplankton that transfer carbon to the deep ocean.
While plastic does have a large carbon footprint, it is important to consider the carbon footprint of alternative materials. For example, a paper bag may weigh twice as much as a plastic bag, requiring more material to be produced and transported, and resulting in twice the weight of waste at the end of its useful life. However, if consumers reuse paper bags but do not reuse plastic bags, plastic's advantage in this regard is diminished.
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Alternatives to plastic may have higher carbon emissions
Plastic production and disposal emit around 3% of global emissions, or 1.8 billion tonnes. This is a significant contributor to global warming. However, it is important to consider the alternatives.
Many of the alternatives to plastic have a higher carbon footprint. For example, a paper bag weighs twice as much as a plastic bag. This means that twice as much material must be produced, transported, and managed at the end of its life. This results in higher GHG emissions for production and transportation. Similarly, glass bottles break more easily than plastic bottles, and additional GHG emissions are incurred from soft drink and bottle production to compensate for the incremental spoilage and breakage of glass bottles.
In an evaluation of 20 common food categories, it was found that plastic packaging is used in more than 90% of products sold in six categories, including bottled water and fresh meat. In another eight categories, including milk and edible oil, plastics are present in the packaging of more than 50% of products sold. In these applications, plastic products release 10% to 90% fewer emissions across the product life cycle.
However, there are some alternatives to plastic that have a lower climate impact. For example, steel drums have higher levels of GHG emissions in production, but they last twice as long as plastic drums and are more recyclable. Overall, using a single steel drum instead of two plastic drums over 10 years results in approximately 25% lower climate impact.
While plastic production and disposal contribute significantly to global emissions, it is important to consider the alternatives. In most cases, replacing plastics with alternative materials leads to higher full life-cycle emissions. However, there are some exceptions, such as steel drums, which have a lower climate impact over their lifetime.
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Frequently asked questions
Yes, carbon dioxide is released during plastic production.
According to the OECD, the life-cycle emissions of plastics were 1.8 billion tonnes, with most of it coming from the production stage.
Carbon dioxide emissions during plastic production come from the extraction and distillation of petroleum, as well as the energy required for these processes.
Paper and glass have been suggested as alternatives to plastic, but they may not always be more environmentally friendly. Paper bags, for example, weigh more than plastic bags, requiring more energy for transportation. Glass manufacturing also causes massive emissions, and recycled glass is problematic as it can only be recycled once or twice. However, some alternatives, like cellulose-based Woodly®, have a negative global warming potential.
To reduce emissions from plastic production, systemic shifts may be required. Some possible solutions include using bio-based feedstocks, increasing the use of renewable energy sources, and slowing the rising demand for plastics.
