It’s not just the decline in fish and other marine species that’s worrying environmentalists and many others; it’s a growth in rubbish. Part of this is caused by natural disasters, such as the 2011 Tsunami in Japan that washed huge amounts of debris into the Pacific Ocean. But much of it is caused by rubbish carried down rivers and into the seas, or rubbish jettisoned from ships. The problem is particularly acute in areas of the oceans where currents circulate the rubbish into huge rubbish dumps. There are two such areas either side of Hawaii in the Pacific. Both are vast.
The first article below tells the tale of Newcastle (Australia) yachtsman Ivan Macfadyen. He completed the 2013 Melbourne to Osaka double handed yacht race earlier this year as skipper of his yacht Funnelweb and then went on to bring the yacht home to Australia via America and race the famous Trans-Pac Yacht Race from Los Angeles to Hawaii along the way.
Exactly 10 years before, when [he] had sailed exactly the same course from Melbourne to Osaka, all he’d had to do to catch a fish from the ocean between Brisbane and Japan was throw out a baited line.
“There was not one of the 28 days on that portion of the trip when we didn’t catch a good-sized fish to cook up and eat with some rice,” Macfadyen recalled. But this time, on that whole long leg of sea journey, the total catch was two. No fish. No birds. Hardly a sign of life at all.
After reaching Osaka in Japan, they sailed on to San Francisco via Hawaii.
“After we left Japan, it felt as if the ocean itself was dead,” Macfadyen said. “We hardly saw any living things. We saw one whale, sort of rolling helplessly on the surface with what looked like a big tumour on its head. It was pretty sickening.”
“I’ve done a lot of miles on the ocean in my life and I’m used to seeing turtles, dolphins, sharks and big flurries of feeding birds. But this time, for 3000 nautical miles there was nothing alive to be seen.”
In place of the missing life was garbage in astounding volumes.
As economists, you should readily understand that here we have a case of over-exploited common resources – a Tragedy of the Commons of epic proportions. One ship’s rubbish may make a tiny difference, but when the cost of dumping is near zero and when the oceans are not policed, what is rational for a single ship becomes a disaster when repeated tens of thousands of times by other ships
Common resources are not owned but are available free of charge to anyone. Examples include the air we breathe and the oceans for fishing. Like public goods, they are non-excludable. For example, fishing boats can take as many fish as they are able from the open seas. There is no ‘owner’ of the fish to stop them. As long as there are plentiful stocks of fish, there is no problem.
But as more people fish the seas, so fish stocks are likely to run down. This is where common resources differ from public goods. There is rivalry. One person’s use of a common resource diminishes the amount available for others. This result is an overuse of common resources. This is why fish stocks in many parts of the world are severely depleted, why virgin forests are disappearing (cut down for timber or firewood), why many roads are so congested and why the atmosphere is becoming so polluted (being used as a common ‘dump’ for emissions). In each case, a resource that is freely available is overused. This has become known as the tragedy of the commons.
… When I use a common resource, I am reducing the amount available for others. I am imposing a cost on other people: an external cost. If I am motivated purely by self-interest, I will not take these external costs into account.
Try doing some research to find out just what has been happening to the state of the oceans in recent years.
The ocean is broken Newcastle Herald (Australia), Greg Ray (18/10/13)
Our Planet Is Exploding With Ocean Dead Zones Business Insider, Dina Spector (26/6/13)
Health of oceans ‘declining fast’ BBC News, Roger Harrabin (3/10/13)
Chaos in the Oceans Huffington Post, Evaggelos Vallianatos (14/10/13)
Ocean Health Suffers from Overfishing, Index Finds Live Science, TechMedia, Douglas Main (16/10/13)