24 March 2013
Author: Tom Levitt
As the human footprint has spread, the remaining wildernesses on our planet have retreated. However, dive just a few meters below the ocean surface and you will enter a world where humans very rarely venture.
In many ways, it is the forgotten world on Earth. A ridiculous thought when you consider that oceans make up 90% of the living volume of the planet and are home to more than one million species, ranging from the largest animal on the planet -- the blue whale -- to one of the weirdest -- the blobfish.
Remoteness, however, has not left the oceans and their inhabitants unaffected by humans, with overfishing, climate change and pollution destabilizing marine environments across the world.
Many marine scientists consider overfishing to be the greatest of these threats. The Census of Marine Life, a decade-long international survey of ocean life completed in 2010, estimated that 90% of the big fish had disappeared from the world's oceans, victims primarily of overfishing. Tens of thousands of bluefin tuna were caught every year in the North Sea in the 1930s and 1940s. Today, they have disappeared across the seas of Northern Europe. Halibut has suffered a similar fate, largely vanishing from the North Atlantic in the 19th century.
In some cases, the collapse has spread to entire fisheries. The remaining fishing trawlers in the Irish Sea, for example, bring back nothing more than prawns and scallops, says marine biologist Callum Roberts, from the UK's York University.
For more, go to: http://edition.cnn.com/2013/03/22/world/oceans-overfishing-climate-change/