With all due respect to Kermit the Frog, it's easy being green. Although we may be overwhelmed by the environmental catastrophes that seem to occur around us with alarming regularity, Karen Pearce says there is a simple way each and every person can make a difference. It doesn't involve travelling the world to clean up oil spills or standing in the path of bulldozers to prevent land clearing. It actually involves shopping …
Plastic shopping bags and the environment
The environmental issues associated with plastic shopping bags have featured in the news in the last couple of months, following the apparent success of the plastic bag tax in Ireland in reducing the number of plastic shopping bags that are used in that country. While this approach has also been suggested for addressing the problem in Australia, the government will examine a number of options before deciding on a management plan. In the meantime, the best thing we can do for the environment is simply reuse, or better yet, refuse a plastic bag when we go shopping. Easy!
Plastic shopping bags have a surprisingly significant environmental impact for something so seemingly innocuous. As well as being an eyesore (next time you are outside, have a look around - you'll be amazed at the number of plastic bags littering our streets and waterways), plastic shopping bags kill large numbers of wildlife each year. In the water, plastic bags can be mistaken for jellyfish by wildlife. This makes plastic bag pollution in marine environments particularly dangerous, as birds, whales, seals and turtles ingest the bags then die from intestinal blockages. Disturbingly, it is claimed that plastic bags are the most common man-made item seen by sailors at sea.
The biggest problem with plastic bags is that they do not readily break down in the environment, with estimates for the time it takes them to decompose ranging from 20 to 1000 years. One of the disquieting facts stemming from this is that plastic bags can become serial killers. Once an animal that had ingested a plastic bag dies, it decays at a much faster rate than the bag. Once the animal has decomposed, the bag is released back into the environment more or less intact, ready to be eaten by another misguided organism. The incredibly slow rate of decay of plastic bags also means that each bag we use compounds the problem, because the bags simply accumulate.
Plastic bags also clog drains and waterways, threatening not only natural environments but also urban ones. In fact, plastic bags in drains were identified as major factors in the severe flooding in Bangladesh in 1988 and 1998. This has resulted in a ban on plastic bags being imposed there early in 2002.
On top of the significant environmental costs, widespread use of plastic bags is also costly in terms of dollars and cents. Apart from the price of the bags themselves, which is four to six cents each, a great deal of money goes into collecting the bags (ie cleaning up!) once they've been discarded.
http://www.abc.net.au/science/features/bags/default.htm
The biggest problem with plastic bags is that they do not readily break down in the environment, with estimates for the time it takes them to decompose ranging from 20 to 1000 years. One of the disquieting facts stemming from this is that plastic bags can become serial killers. Once an animal that had ingested a plastic bag dies, it decays at a much faster rate than the bag. Once the animal has decomposed, the bag is released back into the environment more or less intact, ready to be eaten by another misguided organism. The incredibly slow rate of decay of plastic bags also means that each bag we use compounds the problem, because the bags simply accumulate.
Plastic bags also clog drains and waterways, threatening not only natural environments but also urban ones. In fact, plastic bags in drains were identified as major factors in the severe flooding in Bangladesh in 1988 and 1998. This has resulted in a ban on plastic bags being imposed there early in 2002.
On top of the significant environmental costs, widespread use of plastic bags is also costly in terms of dollars and cents. Apart from the price of the bags themselves, which is four to six cents each, a great deal of money goes into collecting the bags (ie cleaning up!) once they've been discarded.
http://www.abc.net.au/science/features/bags/default.htm
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