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Mar 18, 2009

Adapted from an article by Roz Cohen, Sea Turtle Flagship Program Volunteer


Mr. McGuire: I just want to say one word to you – just one word.
Ben: Yes, sir.
Mr. McGuire: Are you listening?
Ben: Yes, I am.
Mr. McGuire: “Plastics.”
Ben: Exactly how do you mean?
Mr. McGuire: There’s a great future in plastics. Think about it. Will you think about it?
Ben: Yes, I will.
When Walter Brooke, as Mr. McGuire, spoke those words to Dustin Hoffman in his legendary role as Benjamin Braddock in the classic film The Graduate, audiences would not have known just how enduring the future of plastics would be. Quite likely, the very same plastics discarded in 1967, the year The Graduate took movie-goers by storm, still exist in landfills and the ocean today.
In fact, plastics now make up 60-80% of all marine debris – a percentage increasing at an alarming rate – with dire consequences for marine wildlife, including sea turtles.

Whether you live far inland or near the coasts, your actions have an impact on marine pollution.
---About 80% of marine debris, including plastics, comes from land-based sources such as landfills, industrial facilities, recreational activities, and sewage and storm runoff. These wastes can be carried great distances to the coasts and oceans by rivers, storm drains, and winds.
---The other 20% of marine debris comes from merchant and passenger ships, offshore oil and gas platforms, fish farming operations, and other recreational, commercial, and military craft.

Plastics are popular because they are strong, durable, lightweight, and inexpensive. Unfortunately, these same characteristics also make plastics a danger to the environment, as they are persistent and easily carried by winds and currents. Aside from the direct physical impacts of plastic debris, the production of plastics, which are petroleum based, is also resource intensive and may contribute to climate change.
Sea turtles and other marine species are affected by plastic debris.
The impacts of plastics on sea turtles fall into two main categories:
Entanglement and Ingestion.

Sea turtles entangled in plastic straps, ropes, lines, and nets can become trapped beneath the ocean surface and drown or may suffer injury or interference with their regular behaviours.

Ingestion of plastic fragments is also a real risk for sea turtles. Evidence suggests that turtles – especially young ones – feed indis­criminately, and plastic pieces often collect with passive drifting food sources. When ingested, some small plastic pieces can pass through the gut, but larger pieces completely block the digestive passages. Sharp-edged fragments cause internal injuries and infections. Plastic particles can also accumulate in the gut, where they suppress hunger and may lead to death.

An informal survey of professionals studying sea turtle stranding shows that the threats to sea turtles from plastic debris vary consider­ably around the world. More systematic studies are needed to explain these differences and to explore the possible ecosystem-wide effects of marine plastic debris. Despite some noteworthy efforts to reduce marine pollution, the problem is growing.
Fortunately, we, as individuals, can have a profound, positive effect by taking simple steps to reduce, recycle, and clean up

 Reduce. Decrease your consumption of single-use, disposable plastic products. Bring your own reusable bags to the store, use refillable water bottles instead of single-use bottles and containers, and avoid products that use excessive packaging.
Recycle. It is nearly impossible to avoid plastic altogether. When you do use plastic, be sure to recycle it. If you don't have a recy­cling program in your town, school, or place of work, request one! The demand for recyclable PET (polyethylene terephthalate, made from natural gas and petroleum) plastic is so high and the supply so low that recyclers are looking everywhere for new sources.
Clean up. The Ocean Conservancy’s Inter­national Coastal Cleanup is one successful effort in which volunteers around the world collect trash from local coasts and waterways.

Plastics by the Numbers
More than 2.27 billion kg. (5 billion lbs.) of PET (polyethylene terephthalate) plastic products were manufactured in the United States in 2005.
In the United States, less than 25 percent of plastic bottles are recycled.
Anywhere from 500 billion to 5 trillion plastic bags are used worldwide each year. Americans alone use about 380 billion plastic bags, sacks, and wraps each year.
According to the city of San Francisco, less than 1 percent of plastic bags are recycled worldwide; 2 percent are recycled in the United States.
Roughly 6.4 million tons of marine litter are deposited in oceans and seas each year.
Sixty percent of trash on beaches is plastic. Ninety percent of debris floating in the ocean is plastic.
More than 13,000 pieces of plastic litter are floating on every square kilometer of ocean today (46,000 pieces per square mile).
On a single day in 2006, volunteers with the Ocean Conservancy’s International Coastal Cleanup helped clean 55,619 km (34,560 miles) of shoreline and removed about 3.18 million kg (7 million lbs.) of trash; divers collected 103,079 kg (227,250 lbs.) of debris from the riverbed and seafloor.
In the North Pacific gyre, there are about 3 kg (6 lbs.) of plastic for every 0.5 kg (1 lb.) of zooplankton in the water column.
Discarded plastic fishing gear and other plastic marine debris kill more than 1 million seabirds and 100,000 marine mammals and sea turtles each year.
Worldwide, at least 267 species are affected by marine debris. This article is just one of the features in SWOT Report – The State of the World's Sea Turtles, Vol. III, the latest issue of the annual magazine. 
Read all of the features and learn more about the marine work CI does in partnership with the IUCN Marine Turtle Specialist Group (MTSG) and the network of more than 400 conservationists who contribute data to the SWOT database at

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Posted: Mar 18, 2009 3:51pm


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Jenny Dooley
, 3, 2 children
Eastlakes, SW, Australia
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