Maya Ellison
Plastic bags are everywhere, used for almost any task that requires a bag. They are made from polymers derived from crude oil and natural gas. The process of making plastic from oil was discovered in 1862 by Alexander Parkes, who found that heating cellulose creates a flexible substance that holds its shape. Today, plastic bags are made from polyethylene, which can be used to make plastics of different densities. This makes polyethylene useful for a variety of applications, from milk cartons to shopping bags. Despite their convenience, plastic bags have detrimental side effects on the environment, contributing to petroleum emissions and depletion.
| Characteristics | Values |
|---|---|
| Are plastic bags made from oil? | Yes, plastic bags are made from petroleum/oil. |
| How are plastic bags made from oil? | Plastic bags are made from polymers, which are molecules comprising many repeating units, in formations that give plastics many desired qualities such as flexibility, malleability, and strength. |
| How much oil is used to make plastic bags? | It is estimated that about 12 million barrels of oil a year are used in making the plastic bags used in the US. |
| What are the alternatives to plastic bags? | Many companies have opted for recycled or 3D-printed versions that work to eliminate waste. |
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What You'll Learn
Plastic bags are made from harmful polyethylene
Plastic bags are made from polyethylene, a polymer derived from natural gas, petroleum, or other fossil fuels. Polyethylene is a synthetic plastic, and its production involves the use of chemical additives and fillers. While it is considered one of the safest plastics, with organisations like the International Agency for Research on Cancer (IARC) and the Occupational Safety and Health Administration (OSHA) finding it to be non-carcinogenic, it still poses environmental and health risks.
Polyethylene is a versatile plastic that can be manipulated into various shapes and densities, making it suitable for multiple applications. This adaptability is due to the ability to form long chains of hydrogen and carbon atoms, which can be structured differently to create varying types of polyethylene. However, this versatility also contributes to its environmental impact, as plastic bags are often discarded after a single use. The average American throws away about 10 plastic bags a week, amounting to an estimated total of 100 billion plastic bags thrown away annually in the US.
The production of plastic bags contributes to the depletion of precious resources like petroleum. Additionally, the synthetic nature of polyethylene means that once plastic bags are created, they remain synthetic throughout their lives, unable to be broken down into an organic state. While plastic bags can be recycled, they are typically used to create other synthetic materials, perpetuating the presence of synthetic plastics.
Furthermore, the additives and fillers used in polyethylene can have harmful effects. Chemical additives in plastics have been found to migrate, release, and impact the environment during use, disposal, and recycling. These additives contribute to the overall toxicity of plastic bags, which can leach harmful chemicals into the environment and potentially affect human health.
The harmful impacts of plastic bags made from polyethylene highlight the importance of reducing their use and promoting reusable alternatives. Initiatives such as providing free custom reusable bags can help cut down on the contamination caused by plastic bags and encourage more sustainable practices.
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Polyethylene is derived from crude oil
Plastic bags are made from plastic, which can be derived from crude oil. Crude oil is a source of raw material (feedstock) for making plastics. However, it is not the major source of feedstock for plastics production in the United States. Natural gas and feedstocks derived from natural gas processing and crude oil refining are also used.
Polyethylene is a type of plastic that is commonly used to make plastic bags. It is a polymer, which means it is made up of many repeating units of molecules. These molecules form chains that give polyethylene its flexibility, malleability, and strength. Polyethylene can also be used to make plastics of different densities, making it suitable for a wide range of applications.
The process of converting crude oil into polyethylene involves several steps. First, initiators are added to start the chain reaction of polymerization of ethylene into polyethylene. After the formation of polyethylene, some chemicals (antioxidants and stabilizers) are added, and the material is processed into strings and then ground into pellets. These pellets are then melted and converted into the final product.
The commercial production of polyethylene began with the development of catalysts that promoted polymerization at mild temperatures and pressures. The first of these catalysts was based on chromium trioxide and was discovered in 1951. In 1953, a German chemist named Karl Ziegler developed a catalytic system based on titanium halides and organoaluminium compounds that worked at even milder conditions. These catalytic systems have been heavily used in industrial polyethylene production.
While the majority of plastic in use today is synthetic and derived from crude oil, there is a growing demand for newer plastics derived from renewable resources. Bio-based plastics, for example, are made from renewable products such as carbohydrates, starch, vegetable fats, and oils. However, it is important to note that not all bio-based plastics are biodegradable.
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Oil is extremely cheap, but plastic is expensive
Plastic bags are made from oil, specifically crude oil. Crude oil is a type of fossil fuel that is also used to make gasoline, diesel, kerosene, and propane. While oil is a non-renewable resource, meaning that there is a finite amount of it available on Earth, it is currently extremely cheap. For example, in 2014, a barrel of oil cost around $90 to $100, and in 2015, a barrel of oil cost around $48 to $50. A barrel typically contains 42 gallons of oil, making the price per gallon between $2 and $2.38. This makes oil cheaper than many other liquids, such as bottled water, milk, and orange juice. In fact, in some parts of the world, oil is even cheaper than tap water.
On the other hand, plastic is considered to be an expensive product. This is because the process of turning oil into plastic is complex and costly. Additionally, the demand for plastic is high, as it is a versatile material used in a wide range of products, from single-use items like plastic bags, straws, and water bottles to more durable goods like shampoo containers and car parts.
The discrepancy between the price of oil and the price of plastic can be explained by the law of supply and demand. Oil has a high supply, as it is a crucial fuel source for many industries, while plastic has a high demand due to its versatility and durability. Furthermore, plastic goods can be produced at a large scale, driving down prices.
It is worth noting that the price of oil has fluctuated over time and is expected to increase as reserves diminish. However, new reserves continue to be discovered, and technology has enabled more efficient extraction methods, keeping the price relatively stable.
In summary, while oil is a non-renewable resource with a finite supply, it is currently abundant and inexpensive. Plastic, on the other hand, is derived from oil through a complex process and is in high demand due to its versatility. This demand, coupled with the ability to produce plastic goods at scale, contributes to the relatively higher cost of plastic compared to oil.
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Plastic bags contribute to petroleum depletion
Plastic bags are made from polymers, which are molecules comprising many repeating units, giving plastics qualities like flexibility, malleability, and strength. Synthetic plastics, which include plastic bags, are made from crude oil and natural gas.
Secondly, plastic bags have a detrimental impact on the environment, wildlife, and human health. They are a major contributor to the massive pile of plastic debris in the North Pacific Ocean, known as the Great Pacific Garbage Patch. Plastic bags kill approximately 100,000 animals annually, as creatures like whales, dolphins, turtles, penguins, and dolphins mistake them for food. The ingestion of plastic leads to health complications and eventual death, as plastic cannot be properly digested. Even after the animal decomposes, the ingested plastic remains intact, posing a risk to other animals.
Additionally, plastic bags expose humans to toxic chemicals like Bisphenol-A (BPA), which is used to make plastic more flexible and durable. Studies have linked BPA to various health issues, including reproductive problems, diabetes, liver toxicity, and heart disease. The presence of these toxic chemicals in plastic manufacturing also contributes to environmental pollution.
The widespread use and disposal of plastic bags, coupled with their long decomposition time of up to 2000 years, further exacerbates the problem. The US, for instance, throws away approximately 100 billion plastic bags each year, leading to a significant waste problem and increased pressure on petroleum resources.
To address this issue, individuals can adopt a single-use plastic-free lifestyle by investing in reusable bags, cups, and cutlery, and businesses can opt for reusable or recyclable alternatives for packaging and marketing purposes.
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Plastic bags can be replaced by reusable bags
Plastic bags are made from oil, specifically crude oil. Crude oil and natural gas are used to make synthetic plastics, which are used to make plastic bags. Plastic bags are a major contributor to the harm of marine life and wildlife, as they are often mistaken for food.
Reusable bags can replace plastic bags. Using a reusable bag is a simple but effective way to promote sustainable habits. It is estimated that one reusable bag can replace around 700 plastic bags annually. This is because reusable bags are designed to last and can withstand hundreds of uses, making them far more durable than disposable plastic bags. By making the switch, you are reducing plastic waste and conserving the resources needed to produce plastic bags, like petroleum and natural gas. Over time, this small change can contribute to a significant decrease in pollution, helping to protect the planet for future generations.
However, it is important to consider the material of the reusable bag. For example, cloth bags are typically made from cotton, a crop that requires a lot of pesticides and water. Reusable bags made from nonwoven polypropylene plastic are also common, and they are less carbon-intensive to produce. The best option is to use a bag you already have or buy one second-hand.
Some argue that single-use plastic bags have the smallest carbon footprint, as producing them carries the lowest environmental toll compared to other types of bags. However, these studies often assume that plastic bags are used multiple times and do not take into account the effects of litter. Plastic bags are recyclable, but few people recycle them, and recycling plastic bags is a difficult task.
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Frequently asked questions
Yes, plastic bags are made from oil.
Plastic bags are made from polymers, which are molecules made up of many repeating units. These polymers are derived from crude oil and natural gas.
Plastic bags have detrimental side effects on the environment. They contribute to petroleum emissions and depletion, and an estimated 100 billion plastic bags are thrown away annually in the US alone.
