Chloe Zhang
Plastic is known to release harmful gases at every stage of its life cycle, from production to decomposition. The gases emitted during the production of plastic are fluorinated gases, which include hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride. These gases are emitted during the extraction and transportation of fossil fuels, as well as during the refining and manufacturing processes. During degradation, plastic emits methane and ethylene gases, which are greenhouse gases that contribute to global warming and climate change. The combustion or burning of plastic also releases toxic gases such as dioxins, furans, mercury, and polychlorinated biphenyls. These gases pose a threat to human, animal, and environmental health.
| Characteristics | Values |
|---|---|
| Gases released during plastic production | Fluorinated gases, Carbon dioxide, Methane, Hydrofluorocarbons, Perfluorocarbons, Sulfur hexafluoride, Nitrogen trifluoride |
| Gases released during plastic degradation | Methane, Ethylene, Ethane, Propylene, Hydrocarbon gases |
| Gases released during plastic combustion | Dioxins, Furans, Mercury, Polychlorinated Biphenyls, Halogens |
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What You'll Learn
Plastic waste releases methane and ethylene during degradation
Plastic is a significant contributor to climate change. Oil, gas, and coal are the fossil-fuel building blocks of plastics, and the extraction and transportation of these fuels is a carbon-intensive activity. Plastics generate heat-trapping gases at every stage of their life cycle.
Once plastic waste is exposed to the environment, it undergoes degradation processes caused by environmental factors such as light, heat, moisture, chemical oxidation, and biological activity. These processes affect the chemical integrity of the plastic and result in the fragmentation of the polymer into smaller units, increasing the surface area exposed to the elements. As a result, plastic waste releases a variety of chemicals, including greenhouse gases like methane and ethylene, when exposed to ambient solar radiation.
Methane (CH4) and ethylene (C2H4) are the two most commonly produced gases from plastic degradation. Low-density polyethylene, the most commonly produced and discarded synthetic polymer globally, is the most prolific emitter of both gases. The production of these gases increases with time, and the rates measured at the end of a 212-day incubation period were 5.8 nmol g-1 d-1 of methane and 14.5 nmol g-1 d-1 of ethylene.
The fate of these gases is uncertain, but they are likely to undergo bacterial oxidation to carbon dioxide, with a portion emitted into the atmosphere. As the production and accumulation of plastic in the environment increase, the amount of CH4 and C2H4 emitted from polymers is also expected to rise. In addition, plastic degradation leads to the formation of microplastics, which have a greater surface area and can further contribute to environmental and human health issues.
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Drilling for fossil fuels produces methane
The production of plastic is closely linked to the extraction of fossil fuels. Natural gas and oil, both fossil fuels, are used as feedstock for making plastics. Natural gas is a fossil fuel composed primarily of methane, a highly potent warming gas.
Drilling for fossil fuels, particularly natural gas, can release methane into the atmosphere. Natural gas is often found in shale, sandstone, and carbonate rock formations. Horizontal and directional drilling techniques, as well as hydraulic fracturing (fracking), are used to extract natural gas from these formations. Fracking involves pumping liquids under high pressure into wells to fracture the rock and release natural gas. This process can result in methane leaks during and after drilling.
Additionally, natural gas produced at oil wells may be burned (flared) on-site if it is not economical for transport or contains high levels of hydrogen sulfide, a toxic gas. Flaring produces carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen oxides, and other compounds, and while it results in lower overall greenhouse gas emissions compared to releasing methane, it still contributes to atmospheric pollution.
The extraction and transportation of natural gas for plastic production emit significant amounts of carbon dioxide equivalents annually. Furthermore, the wastewater generated during fracking may contain hazardous chemicals, and improper treatment or disposal can lead to environmental contamination.
The impact of methane emissions from fossil fuel extraction is significant. Recent studies indicate that the methane contribution from fossil fuel acquisition and burning is nearly 200 teragrams per year, far exceeding previous estimates of 10% from natural geologic sources. This highlights the urgent need to address methane leaks in the fossil fuel industry to mitigate climate change.
In summary, drilling for fossil fuels, particularly natural gas, releases methane, a potent greenhouse gas, into the atmosphere. The production and use of plastics, which rely heavily on natural gas and oil as feedstock, contribute to climate change and environmental pollution at various stages of their life cycle. Addressing methane emissions from the fossil fuel industry is crucial for combating climate change and meeting global climate goals.
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Burning plastic releases toxic gases
Plastics are derived from fossil fuels, with natural gas and oil being extracted through fracking. The extraction and transportation of these fossil fuels are carbon-intensive activities, emitting millions of tons of carbon dioxide each year. Even before plastics are burned, they contribute to climate change at every stage of their life cycle, generating heat-trapping gases.
When plastics are burned, they release toxic chemicals and heavy metals such as dioxin, mercury, and polychlorinated biphenyls. These substances are harmful to human health and the environment. Burning plastic waste is a common method of disposal, especially in areas lacking solid waste collection services. However, it contributes to air pollution and can cause various health issues, including eye and nose irritation, coughing, headaches, and respiratory problems.
The toxic gases and chemicals released during the burning of plastics pose a serious risk to public health and the environment. The accumulation of these toxins in the body can lead to neurodevelopmental, endocrine, and reproductive issues. Additionally, the ash produced from burning plastic can impact human health by leaching heavy metals and toxic compounds into water sources and the food chain.
To address the negative impacts of burning plastic, alternatives are being explored, such as waste disposal projects, community recycling, and reforestation initiatives. These efforts aim to reduce the use of plastic, promote recycling, and implement cleaner methods of waste management to minimize the release of toxic gases and their detrimental effects on human health and the environment.
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Low-density polyethylene releases greenhouse gases as it breaks down
Plastics generate heat-trapping gases at every stage of their life cycle. Oil, gas, and coal are the fossil-fuel building blocks of plastics. Natural gas and oil can be extracted from the earth through fracking, a carbon-intensive activity. Extraction and transportation of these fossil fuels contribute to the emission of greenhouse gases.
The production, refining, and incineration of plastics also release greenhouse gases. In 2015, emissions from manufacturing ethylene, the building block for polyethylene plastics, were 184.3 to 213 million metric tons of carbon dioxide equivalent. Globally, carbon dioxide emissions from ethylene production are projected to increase by 34% between 2015 and 2030.
Low-density polyethylene, one of the most common types of plastics found in the ocean, releases greenhouse gases as it breaks down in the environment. A study conducted at the University of Hawai'i found that as plastics decay, they emit traces of methane and ethylene, two powerful greenhouse gases. The rate of emission increases over time and is higher in the air than in water.
Methane is a greenhouse gas that is far less prevalent but significantly more potent than carbon dioxide. According to the Intergovernmental Panel on Climate Change, methane traps heat and warms the planet 86 times more than carbon dioxide over a 20-year period. Addressing methane emissions is crucial in the fight against global warming.
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Extraction and transportation of fossil fuels are carbon-intensive
The gases released during the production of plastics are methane, ethylene, ethane, and propylene. These gases are produced when plastics are exposed to ambient solar radiation. Polyethylene, the most commonly produced and discarded synthetic polymer globally, is the most significant emitter of these gases.
The production of plastic involves the use of fossil fuels, particularly oil, gas, and coal. These fossil fuels are extracted from the earth through processes such as drilling and fracking, which can have negative environmental and health impacts. For example, fracking has been linked to air and water pollution, and mining operations can release toxic airborne particulate matter.
Additionally, the burning of fossil fuels is a major source of greenhouse gas emissions. In 2020, oil combustion accounted for 45% of U.S. energy-related carbon dioxide emissions. The transportation sector, which relies heavily on oil, is the largest consumer of petroleum products. Furthermore, the extraction and transportation of fossil fuels can lead to leaks and spills, causing pollution in oceans, wetlands, freshwater sources, and other ecosystems.
To mitigate the carbon intensity of fossil fuel extraction and transportation, a transition to renewable energy sources such as hydropower, biomass, wind, geothermal, and solar energy is necessary. Improving energy efficiency and reducing energy demand through the use of public transit, walking, or biking can also help reduce carbon emissions associated with fossil fuels.
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Frequently asked questions
Plastic releases methane and ethylene gases during degradation, which happens when exposed to ambient solar radiation.
Drilling to extract fossil fuels produces methane gas, and any combustion during extraction emits greenhouse gases. The extraction and transportation of fossil fuels are carbon-intensive activities.
Burning plastic releases toxic gases like dioxins, furans, mercury, and polychlorinated biphenyls. Burning Polyvinyl Chloride releases hazardous halogens.
