Millions of plastic bags are given out to consumers by supermarkets and stores to carry their goods in. They are also cheap‚ light‚ durable‚ easy to carry and in many cases‚ free. The most commonly used shopping bag is made of High Density Polyethylene (HDPE). This type is used in the majority of supermarkets and stores. After these bags are used‚ they often end up in landfills or as litter‚ roughly only three percent of plastic bags is actually recycled per year (Planet Ark‚ 2011). The materials
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molecules in starch - amylose and amylopectin. The alpha linkage of amylose starch allows it to be flexible and digestible. Starch-based biodegradable plastics may have starch contents ranging from 10% to greater than 90%. Starch based polymers can be based on crops such as corn (maize)‚ wheat or potatoes. Starch content needs to exceed 60% before significant material breakdown occurs. As the starch content is increased‚ the polymer composites become more biodegradable and leave less recalcitrant
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NOTES Every day over 10million new plastic bags are being created‚ that’s over 3.92 billion new plastic bags every year. You may think plastic bags are harmless‚ but the every time you accept plastic bags at a check out‚ you are damaging the environment we live in. For that one time you use that plastic bag‚ it can last from 500-100years. You may think you are helping the environment when you are buying biodegradable bags‚ but they take just as long to degrade. But there is a way to help the
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Plastic Bags Should Be Banned Thesis: Today when we go shopping‚ we will see a lot of people carrying their shopping bags made of plastic. Plastic bags are really convenient for all of us to carry things we have bought. In contrast‚ there are many disadvantages of using plastic bags. If you know that plastic bags have negative impacts for our environment‚ I am sure that reducing the use of plastic bags will be happened soon. Con: they are really convenient for all of us to carry
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Phase-out of lightweight plastic bags From Wikipedia‚ the free encyclopedia Ambox current red.svg This article is outdated. Please update this article to reflect recent events or newly available information. (July 2013) Single-use plastic shopping bags are usually distributed (for free) to customers by stores when purchasing goods. It is a popular method that is practiced in many countries for being a strong‚ cheap‚ and hygienic way of transporting items. Lightweight bags are commonly made from
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Plastic Bags and Sustainability Often times‚ there are debates surrounding controversial environmental issues‚ such as global warming‚ deforestation and nuclear power. But then‚ there is little or no public debate on the impact of plastic bags on the environment. Plastic bags kill tens of thousands of animals every year. In the marine environment plastic bag litter is lethal‚ killing tens of thousands of birds‚ whales‚ seals and turtles every year as they often mistake plastic bags for food such
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Plastic bags are not biodegradable‚ so they get littered onto a wasteland which causes soil erosion causing damage and harm to the trees. If plastic bags are burnt‚ they emit hazardous gases causing air pollution which causes damage on the ozone layer. The Plastic can be reduced by u not using lots of plastic and use things in yr homes then going to buy a plastic bottle from the shop. Plastic bags are made out of non-biodegradable substance.(not organic)Because they are durable they do not
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Harmful effect of Plastic Bags Plastic bags have rapidly becoming popular among consumers and retailers due to its convenience and functionality and it comes at a relatively low cost. Wastage and hygiene issue arises as these non- biodegradable bags are usually littered and not recycled. Technological advances that led to even lighter bags have worsened this problem. These lighter bags are often not suitable for reuse and heavy items have to be double bag‚ increasing the use of plastic bags. As a result
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been disputed is the idea of banning plastic bags. As people become more aware of the environment and are attempting help‚ the environment they come up with more ways to. The most known way to help the environment is to reuse and recycle; however‚ many want to go even further than that and ban certain items. There is a recent argument on both a local and global level on the issue of banning plastic bags. There are grocery stores that have already banned plastic bags and there are stores that are debating
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| Latent heat is a science term used to describe the amount of energy that has been absorbed or released when a substance goes through the process of changing states. | Latent Heat of Fusion - heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature The heat absorbed as a substance changes phase from liquid to solid‚ a process called fusion or solidification. For water‚ Latent Heat of Solidification - heat liberated
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