OUR CAMPAIGN : PLASTIC BAGS ? Never AGAIN !
PACIF OCEAN PLASTIC WASTE DUMP
There is a huge plastic waste dump site in the Pacific Ocean that is twice the size of the continental United States.
It is estimated that 10 percent of the world’s plastic waste finds its way into the sea and slowly but surely most of it ends up in the Pacific Ocean.
Sea currents transport the waste into ocean “dead zones”, large areas of water that are slow moving circular currents which trap debris into one large constantly moving mass of plastic.
This mass of plastic is slowly being broken down into a plastic dust that marine wildlife mistake for food. Small fish consume tiny bits of plastic as if they were normal plankton. Those fish are then consumed by larger species and the plastic contamination moves up the food chain.
The UN Environmental Program estimates that over a million seabirds, as well as more than 100 thousand marine mammals, die every year from ingesting plastic debris.
Dead seabirds having mistaken plastics for food, have been found with discarded plastic lighters, water bottle caps and scraps of plastic bags in their stomachs.
Scientifically the area is known as the Northern Pacific Gyre, one of five gyres in the world’s oceans.
They are an area of sea where water circulates clockwise in a very slow spiral. Winds are light and the currents tend to force any floating material into the low energy center of the gyre – everything afloat becomes trapped.
These “dead zones” have been well known to sailors for centuries and they have traditonally avoided them at all costs. Low wind conditions means slow sailing.
Recently some sailors have been taking power assisted short cuts to their destinations and discovering vast areas of plastic garbage in their wake.
Some researchers estimate that there are over six kilos of plastic for every kilo of naturally occurring plankton in the Pacific plastic waste dump.
Besides being a danger in themselves these vast areas of plastic pollution act as chemical sponge attracting other damaging pollutants, such as persistent organic pollutants (POPs), hydrocarbons and DDT that have been dumped in the oceans, creating even more highly damaging toxins for marine wildlife to mistake for food.
The northern Pacific plastic dump is deceptive to the eye. While it contains huge amounts of plastic waste it is not all floating on the surface. Wave action and the heat of the sun degrades the plastic into smaller and smaller particles which can form a sinking toxic soup that extends down to 6 meters below the ocean’s surface.
But there is still enough plastic floating on the surface to create a false habitat for plant and animal organisms to live on. Once attached to the floating surface these species are transported far beyond their normal ecosystems.
These ocean hitchhikers can then invade new habitats to become possible nuisance species in environments that nature didn’t originally intend them to inhabit.
Not all plastic floats. As it breaks down it can begin to sink towards the ocean’s bottom. Dutch scientists have discovered that over 70 percent of discarded plastic eventually sinks to the sea bed.
The Dutch researchers have counted an astounding 600 thousand tonnes of plastic sitting on the North Sea floor. As that ocean floor becomes increasingly smothered by descending bits of plastic sea bed organisms struggle for survival.
Dr. Marcus Eriksen, research Director of the Algalita Institute in Atlanta says, “Whatever goes into the ocean goes into these animals and onto your dinner plate.”
There has been little concern voiced by governments as the Pacific Ocean toxic garbage patch largely lay outside of international waters, outside their normal legislative considerations.
The problem is being intensified as modern plastics become more durable and increasingly more disposable.
As the Pacific plastic dump grows, and it could double in size by 2015, the effect on the human food chain becomes more toxic and problematic.
http://ecology.com/ecology-today/2008/08/14/pacific-plastic-waste-dump/
THE PROBLEM OF PLASTIC
By discarding plastic thoughtlessly, especially fishing gear and packaging, people are accidentally causing the deaths of millions of mammals, birds, reptiles and fish every year.
Since the development of plastic earlier this century, it has become a popular material used in a wide variety of ways. Today plastic is used to make, or wrap around, many of the items we buy or use. The problem comes when we no longer want these items and how we dispose of them, particularly the throwaway plastic material used in wrapping or packaging. Plastics are used because they are easy and cheap to make and they can last a long time. Unfortunately these same useful qualities can make plastic a huge pollution problem. The cheapness means plastic gets discarded easily and its long life means it survives in the environment for long periods where it can do great harm. Because plastic does not decompose, and requires high energy ultra-violet light to break down, the amount of plastic waste in our oceans is steadily increasing.
Studies done locally show about 3 500 particles of plastic per square kilometre of sea off the southern African coast. Surveys of 50 South African beaches from the Eastern Cape to Cape Town show that in five years to 1989 plastic pollution has increased by 190%. More than 90% of the articles found on these beaches contained plastic. Plastic is now found on virtually all South African beaches, even the most remote, and researchers are now also finding plastic rubbish in Antarctic regions.
The plastic rubbish found on beaches near urban areas tends to originate from use on land, such as packaging material used to wrap around other goods. On remote rural beaches the rubbish tends to have come from ships, such as fishing equipment used in the fishing industry.
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THE THREAT TO WILDLIFE
This plastic can affect marine wildlife in two important ways: by entangling creatures, and by being eaten.
Turtles: Turtles are particularly badly affected by plastic pollution, and all seven of the world's turtle species are already either endangered or threatened for a number of reasons. Turtles get entangled in fishing nets, and many sea turtles have been found dead with plastic bags in their stomachs. It is believed they mistake these floating semi-transparent bags for jellyfish and eat them. The turtles die from choking or from being unable to eat. One dead turtle found off Hawaii in the Pacific was found to have more than 1000 pieces of plastic in its stomach including part of a comb, a toy truck wheel and nylon rope.
Marine Mammals: There is great concern about the effect of plastic rubbish on marine mammals in particular, because many of these creatures are already under threat for a variety of other reasons e.g. whale populations have been decimated by uncontrolled hunting. A recent US report concluded that 100 000 marine mammals die each year in the world's oceans by eating or becoming entangled in plastic rubbish, and the position is worsening.When a marine mammal such as a Cape fur seal gets caught up in a large piece of plastic, it may simply drown, or become exhausted and die of starvation due to the greater effort needed to swim, or the plastic may kill slowly over a period of months or years as it bites into the animal causing wounds, loss of blood and/or severing of limbs.
"Ghost Nets": A large number of marine creatures become trapped and killed in "ghost nets". These are pieces of gill nets which have been lost by fishing vessels. Other pieces of fishing equipment such as lobster pots may also keep trapping creatures.
Marine Birds: World-wide, 75 marine bird species are known to eat plastic articles. This includes 36 species found off South Africa. A recent study of blue petrel chicks at South Africa's remote Marion Island showed that 90% of chicks examined had plastic in their stomachs apparently fed to them accidentally by their parents. South African seabirds are among the worst affected in the world. Plastics may remain in the stomachs, blocking digestion and possibly causing starvation. As particular species seem to be badly affected this may be a threat to whole populations of these birds.
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CONSERVATION ACTION
The problem of plastic pollution is serious and requires further urgent study. Immediate action is also required such as :
Reduction of the amount of plastic used in packaging which is usually immediately thrown away. Re-use of plastics should be encouraged.
Plastic wrapping and bags should carry a warning label stating the dangers of plastic pollution, and shoppers should be encouraged to use their own bags, or recycled paper bags.
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WHAT YOU CAN DO
Buy products with less Plastic packaging and tell store Personnel why you are doing so. Shoppers should use their own bags or recycled paper bags.
Support recycling schemes and promote support for one in your local area.
Fishermen throughout South Africa should not throw away waste line, net or plastic litter - this causes huge suffering and many deaths.
Practice and promote proper disposal of plastics in your home and at the beach. Always remember that litter generates litter. Never dispose of plastics in the sewage system.
At the beach dispose of plastics and other litter in the bins provided. If these facilities are inadequate, contact the local authority responsible and lodge a complaint. Take your litter back home with you if there are no receptacles on the beach. Pick up any plastic litter you may see on the beach or in rock pools in the vicinity in which you are sitting or walking. Encourage young children to do likewise.
In the street never throw plastic or other litter out of your car or drop it on the pavement or in the gutter.
Set an example to others and encourage them to help. Plastics are not themselves a problem. They are useful and popular materials which can be produced with relatively little damage to the environment. The problem is the excessive use of plastics in one-off applications together with careless disposal.
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FURTHER READING AND USEFUL ADDRESSES
Dolphin Action and Protection Group, P O Box 22227, Fish Hoek 7975.
The Packaging Council of SA, P O Box 782205, Sandton,2146.
Everyone's guide to Recycling - obtainable from Earthlife Africa P O Box 176, Observatory, 7935.
National Council to Coordinate Recycling, Private Bag X40028, 0007
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ACKNOWLEDGEMENTS
The production of the original Enviro Facts sheets are sponsored by Pick'n Pay and developed with the help of several conservation bodies through the Environmental Education Association of Southern Africa (EEASA).
Gavin Maneveldt has given valuable editing input into this version. Photographs and slides were kindly given by Martin Hendricks, Derek Keats and Gavin Maneveldt (all from the University of the Western Cape).
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