Tuesday, August 11, 2009

Great Pacific Garbage patch

Way out in the Pacific Ocean, in an area once known as the doldrums, an enormous, accidental monument to modern society has formed. Invisible to satellites, poorly understood by scientists and perhaps twice the size of France, the Great Pacific Garbage Patch is not a solid mass, as is sometimes imagined, but a kind of marine soup whose main ingredient is floating plastic debris.

It was discovered in 1997 by a Californian sailor, surfer, volunteer environmentalist and early-retired furniture restorer named Charles Moore, who was heading home with his crew from a sailing race in Hawaii, at the helm of a 50ft catamaran that he had built himself.

For the hell of it, he decided to turn on the engine and take a shortcut across the edge of the North Pacific Subtropical Gyre, a region that seafarers have long avoided.

It is a perennial high pressure zone, an immense slowly spiralling vortex of warm equatorial air that pulls in winds and turns them gently until they expire.

Several major sea currents also converge in the gyre and bring with them most of the flotsam from the Pacific coasts of Southeast Asia, North America, Canada and Mexico.

Fifty years ago nearly all that flotsam was biodegradable.

These days it is 90 per cent plastic.

It took us a week to get across and there was always some plastic thing bobbing by,' says Moore, who speaks in a jaded, sardonic drawl that occasionally flares up into heartfelt oratory. '

Bottle caps, toothbrushes, styrofoam cups, detergent bottles, pieces of polystyrene packaging and plastic bags.

Half of it was just little chips that we couldn't identify.

It wasn't a revelation so much as a gradual sinking feeling that something was terribly wrong here.

Two years later I went back with a fine-mesh net, and that was the real mind-boggling discovery.'

Floating beneath the surface of the water, to a depth of 10 metres, was a multitude of small plastic flecks and particles, in many colours, swirling like snowflakes or fish food.

An awful thought occurred to Moore and he started measuring the weight of plastic in the water compared to that of plankton.

Plastic won, and it wasn't even close. '

We found six times more plastic than plankton, and this was just colossal,' he says.

No one had any idea this was happening, or what it might mean for marine ecosystems, or even where all this stuff was coming from.'

So ended Moore's retirement.

He turned his small volunteer environmental monitoring group into the Algalita Marine Research Foundation, enlisted scientists, launched public awareness campaigns and devoted all his considerable energies to exploring what would become known as the Great Pacific Garbage Patch and studying the broader problem of marine plastic pollution, which is accumulating in all the world's oceans.

The world's navies and commercial shipping fleets make a significant contribution, he discovered, throwing some 639,000 plastic containers overboard every day, along with their other litter.

But after a few more years of sampling ocean water in the gyre and near the mouths of Los Angeles streams, and comparing notes with scientists in Japan and Britain,

Moore concluded that 80 per cent of marine plastic was initially discarded on land, and the United Nations Environmental Programme agrees.

The wind blows plastic rubbish out of littered streets and landfills, and lorries and trains on their way to landfills.

It gets into rivers, streams and storm drains and then rides the tides and currents out to sea.

Litter dropped by people at the beach is also a major source.

Plastic does not biodegrade; no microbe has yet evolved that can feed on it.

But it does photodegrade.

Prolonged exposure to sunlight causes polymer chains to break down into smaller and smaller pieces, a process accelerated by physical friction, such as being blown across a beach or rolled by waves.

This accounts for most of the flecks and fragments in the enormous plastic soup at the becalmed heart of the Pacific, but Moore also found a fantastic profusion of uniformly shaped pellets about 2mm across.

Nearly all the plastic items in our lives begin as these little manufactured pellets of raw plastic resin, which are known in the industry as nurdles.

More than 100 billion kilograms of them are shipped around the world every year, delivered to processing plants and then heated up, treated with other chemicals, stretched and moulded into our familiar products, containers and packaging.

During their loadings and unloadings, however, nurdles have a knack for spilling and escaping.

They are light enough to become airborne in a good wind.

They float wonderfully and can now be found in every ocean in the world, hence their new nickname: mermaids' tears.

You can find nurdles in abundance on almost any seashore in Britain, where litter has increased by 90 per cent in the past 10 years, or on the remotest uninhabited Pacific islands, along with all kinds of other plastic confetti.

There's no such thing as a pristine sandy beach any more,' Charles Moore says. 'The ones that look pristine are usually groomed, and if you look closely you can always find plastic particles.

On Kamilo Beach in Hawaii there are now more plastic particles than sand particles until you dig a foot down.

On Pagan Island [between Hawaii and the Philippines] they have what they call the "shopping beach".

If the islanders need a cigarette lighter, or some flip-flops, or a toy, or a ball for their kids, they go down to the shopping beach and pick it out of all the plastic trash that's washed up there from thousands of miles away.'

On Midway Island, 2,800 miles west of California and 2,200 miles east of Japan, the British wildlife filmmaker Rebecca Hosking found that many thousands of Laysan albatross chicks are dying every year from eating pieces of plastic that their parents mistake for food and bring back for them.

Worldwide, according to the United Nations Environment Programme, plastic is killing a million seabirds a year, and 100,000 marine mammals and turtles.

It kills by entanglement, most commonly in discarded synthetic fishing lines and nets.

It kills by choking throats and gullets and clogging up digestive tracts, leading to fatal constipation.

Bottle caps, pocket combs, cigarette lighters, tampon applicators, cottonbud shafts, toothbrushes, toys, syringes and plastic shopping bags are routinely found in the stomachs of dead seabirds and turtles.

A study of fulmar carcases that washed up on North Sea coastlines found that 95 per cent had plastic in their stomachs – an average of 45 pieces per bird.

Plastic particles are not thought to be toxic themselves but they attract and accumulate chemical poisons already in the water such as DDT and PCBs – nurdles have a special knack for this.

Plastic has been found inside zooplankton and filter-feeders such as mussels and barnacles; the worry is that these plastic pellets and associated toxins are travelling through the marine food chains into the fish on our plates.

Scientists don't know because they are only just beginning to study it.

We do know that whales are ingesting plenty of plastic along with their plankton, and that whales have high concentrations of DDT, PCBs and mercury in their flesh, but that's not proof.

The whales could be getting their toxins directly from the water or by other vectors.

Research on marine plastic debris is still in its infancy and woefully underfunded, but we know that there are six major subtropical gyres in the world's oceans – their combined area amounts to a quarter of the earth's surface – and that they are all accumulating plastic soup.

The Great Pacific Garbage Patch has now been tentatively mapped into an east and west section and the combined weight of plastic there is estimated at three million tons and increasing steadily.

It appears to be the big daddy of them all, but we do not know for sure.

Dr Pearn Niiler of the Scripps Oceanographic Institute in San Diego, the world's leading authority on ocean currents, thinks that there is an even bigger garbage patch in the South Pacific, in the vicinity of Easter Island, but no scientists have yet gone to look.

The French cultural theorist Paul Virilio observed that every new technology opens the possibility for a new form of accident.

By inventing the locomotive, you also invent derailments.

By inventing the aeroplane, you create plane crashes and mid-air collisions.

When Leo Baekeland, a Belgian chemist, started tinkering around in his garage in Yonkers, New York, working on the first synthetic polymer, who could have foreseen that a hundred years later plastic would outweigh plankton six-to-one in the middle of the Pacific Ocean?

Baekeland was trying to mimic shellac, a natural polymer secreted by the Asian scale beetle and used at the time to coat electrical wires.

In 1909 he patented a mouldable hard plastic that he called Bakelite, and which made him very rich indeed.

Chemists were soon experimenting with variations, breaking down the long hydrocarbon chains in crude petroleum into smaller ones and mixing them together, adding chlorine to get PVC, introducing gas to get polystyrene.

Nylon was invented in 1935 and found its first application in stockings, and then after the Second World War came acrylics, foam rubber, polythene, polyurethane,

Plexi­glass and more: an incredible outpouring of new plastic products and the revolution of clear plastic food wraps and containers, which preserved food longer and allowed people to live much further away from where it was produced.

Single-use plastic bags first appeared in the US in 1957 and in British supermarkets in the late 1960s; worldwide there are more than a trillion manufactured every year, although the upward trend is now levelling off and falling in many countries, including Britain.

We reduced our plastic bag use by 26 per cent last year, to 9.9 billion.

Bottled water entered the mass market in the mid-1980s.

Global consumption is now 200 billion litres a year and only one in five of those plastic bottles is recycled.

The total global production of plastic, which was five million tons in the 1950s, is expected to hit 260 million tons this year.

Look around you.

Start counting things made of plastic and don't forget your buttons, the stretch in your underwear, the little caps on the end of your shoelaces.

The stuff is absolutely ubiquitous, forming the most basic infrastructure of modern consumer society.

We are scarely out of the womb when we meet our first plastic: wristband, aspirator, thermometer, disposable nappy.

We gnaw on plastic teething rings and for the rest of our lives scarcely pass a moment away from plastics.

The benefits of plastic, most of which relate to convenience, consumer choice and profit, have been phenomenal.

But except for the small percentage that has been incinerated, every single molecule of plastic that has ever been manufactured is still somewhere in the environment, and some 100 million tons of it are floating in the oceans.

A dead albatross was found recently with a piece of plastic from the 1940s in its stomach.

Even if plastic production halted tomorrow, the planet would be dealing with its environmental consequences for thousands of years, and on the bottom of the oceans, where an estimated 70 per cent of marine plastic debris ends up – water bottles sink fairly quickly – for tens of thousands of years.

It may form a layer in the geological record of the planet, or some microbe may evolve that can digest plastic and find itself supplied with a vast food resource. In the meantime, what can we do?

What we cannot do is clean up the plastic in the oceans.

It's the biggest misunderstanding people have on this issue,' Moore says. 'They think the ocean is like a lake and we can go out with nets and just clean it up.

People find it difficult to grasp the true size of the oceans and the fact that most of this plastic is in tiny pieces and it's everywhere.

All we can do is stop putting more of it in, and that means redesigning our relationship with plastic

1 comment:

Brian Mean said...

What is the solution? I wonder why enterprising businessmen do not simply go out and load this plastic junk up and recycle it? It makes sense to recycle. I would guess that there is nearly a billion dollars worth of plastic in the Great Pacific Garbage Patch? Whom every figures out how to recycle it could easily be one of our newest billionaires as well as being a hero for forestalling the frighting damage being done to various species. I have an idea of how to fix this so both sides win. It can be both profitable as well as good for the planet with the plan that I have.