Saturday’s Map: Ocean Currents

by | Jan 4, 2009


From a special report in The Economist:

Human beings no longer thrive under the water from which their ancestors emerged, but their relationship with the sea remains close. Over half the world’s people live within 100 kilometres (62 miles) of the coast; a tenth are within 10km. On land at least, the sea delights the senses and excites the imagination. The sight and smell of the sea inspire courage and adventure, fear and romance. Though the waves may be rippling or mountainous, the waters angry or calm, the ocean itself is eternal. Its moods pass. Its tides keep to a rhythm. It is unchanging.

Or so it has long seemed. Appearances deceive, though. Large parts of the sea may indeed remain unchanged, but in others, especially in the surface and coastal waters where 90% of marine life is to be found, the impact of man’s activities is increasingly plain. This should hardly be a surprise. Man has changed the landscape and the atmosphere. It would be odd if the seas, which he has for centuries used for food, for transport, for dumping rubbish and, more recently, for recreation, had not also been affected.

The evidence abounds. The fish that once seemed an inexhaustible source of food are now almost everywhere in decline: 90% of large predatory fish (the big ones such as tuna, swordfish and sharks) have gone, according to some scientists. In estuaries and coastal waters, 85% of the large whales have disappeared, and nearly 60% of the small ones. Many of the smaller fish are also in decline. Indeed, most familiar sea creatures, from albatrosses to walruses, from seals to oysters, have suffered huge losses.

Author

  • Charlie Edwards

    Charlie Edwards is Director of National Security and Resilience Studies at the Royal United Services Institute. Prior to RUSI he was a Research Leader at the RAND Corporation focusing on Defence and Security where he conducted research and analysis on a broad range of subject areas including: the evaluation and implementation of counter-violent extremism programmes in Europe and Africa, UK cyber strategy, European emergency management, and the role of the internet in the process of radicalisation. He has undertaken fieldwork in Iraq, Somalia, and the wider Horn of Africa region.

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