The Right Chemistry: Ban plastic bags? It\'s not so simple
You will soon find that every problem is more complicated than it originally looked.
Whether you are exploring the diphenol A, fluoride, O-benzyl ester, genetically modified organisms, dietary supplements, non-
Stick to cookware, preservatives, tap water, pesticides, or climate change and you will find that references in the scientific literature support a variety of views on the surface.
But with the publication of a large number of papers, it is easy to pick references that support almost any agenda.
The quality of scientific publications is bell-shaped: some are prominent, some are frustrating, and most are mediocre.
Any painting of controversial issues, as well as almost every issue, is controversial and should be suspected whether it is white or black.
Science has a variety of shades of gray, and with the exposure of new information, the tone changes.
Risks, always some, must be assessed based on the proceeds.
Of course, not all disputes are equally important, and even the importance of disputes is often controversial.
Disposable plastic bags are a good example.
Some people think that this is a huge environmental disaster that must be eliminated, and while others think that plastic bags constitute a slight environmental disaster, the effort to eliminate plastic bags is equivalent to attacking ants with a jack hammer.
There is no doubt that plastic bags are a symbol of our culture of throwing away and an attractive object of contempt because they are a clear sign of pollution.
From the trees, they can be seen drifting, floating in the well-known plastic debris in the central Pacific Ocean, and blocking the sewers in parts of Asia.
But these bags don\'t dive into the ocean, jump into the sewer or fly without help. Human help.
We are the real problem.
The benefits can be greater than risk through proper recycling, reuse or disposal.
Then, the argument of perceived risk is usually spread around a bag made of oil, which is a non-
Renewable resources, non-renewable plastic
Biodegradable, bags that occupy space in landfill sites because they are ready to replace with paper or reusable bags without the necessary bags, and bags that leave a large amount of carbon footprint.
Disposable bags are made of high
Density polyethylene, made of ethylene from oil or natural gas.
In Canada, ethylene is usually made of ethylene, which is a component of natural gas, otherwise it is usually burned.
As we are often told, plastic bags are not biodegradable in landfill sites.
This is true, but the modern landfill is designed to have a low oxygen environment to prevent biodegradable, resulting in the formation of greenhouse gas methane.
The purpose of the landfill site is to seal the contents and prevent substances from leaking out.
Since plastic bags are highly compressed, they account for very little volume in landfill sites.
In any case, it is estimated that plastic shopping bags account for less than 1 of the garbage.
Paper shopping bags will also not be biodegradable in landfill sites, because they are of greater quality, so it is a greater burden on waste logistics.
Paper manufacturing is an energy-intensive process that requires the use of many chemicals.
Calculations from cradle to grave generally indicate that the carbon footprint of plastic bags is lower than that of paper bags.
The \"biodegradable\" bag is a marketing plan;
They do not degrade under normal circumstances.
But why do we ask the question of plastic and paper, why not rely on reusable bags here as well, the question is not as simple as it seems.
In order for the carbon footprint to be less than the plastic bag, the cotton bag must be used about 130 times.
Growing cotton requires more pesticides than most crops, and processing and transportation requires a lot of energy.
If plastic bags are reused to pack your trash can, a cotton bag must be used more than 300 times in order to reduce the likelihood of global warming.
Reusable plastic bags are usually made of laminated plastic and are not recyclable.
Depending on the type of plastic, whether it is low density polyethylene or non-high density polyethylene
Woven polypropylene, a reusable bag must be used at least 10-
20 times more eco-friendly than disposable bags.
If the reusable bags cannot be cleaned correctly, there is also a contamination problem.
The warm trunk is the perfect incubator to produce bacteria from the remaining gravy in the bag.
If you go to the grocery store next time, or line up in the bin, or collect garbage in the car, or pick up garbage after pets, or in order to cover food in the refrigerator, disposable plastic bags can be recycled well into plastic wood, trash cans, containers and new plastic bags.
Many cities and even countries have banned giving away plastic bags or charged for them.
This has led to the use of more paper bags, rather than environmental advantages, as well as an increase in the sales of plastic bags in trash cans.
The publicity of the plastic bag problem is not proportional to its size.
In terms of energy consumption, it takes about 40 times as much plastic bags to produce hamburgers.
Burgers are not always eaten completely.
Food waste is 10 times that of plastic bags.
When it comes to environmental issues, what you put in your shopping bag is more important than the type of bag.
To reduce waste and encourage reusable bags, it is wise to charge for plastic bags;
A complete ban will cause unnecessary inconvenience.
If you forget your reusable at home and have to stop at the store to buy a late night salad tomato in your pocket and pepper in your other pocket, what would you do