Brothers Ryan and Bryson Robertson and good friend Hugh Patterson set sail in 2007 to embark upon an information gathering mission upon the state of the worlds beaches. They have circumnavigated the globe to document the amount of plastic and to get an idea of mans effect upon our oceans.
take a look at their site for a world of knowledge upon the subject:
http://www.oceangybe.com
The following is quoted from Charles Moore of the Algalita Marine Research Foundation. Dr. Moore is the captain of the private research vessel, the Alguita:
"There is a large part of the central Pacific Ocean that no one ever visits and only a few ever pass through. Sailors avoid it like the plague for it lacks the wind they need to sail. Fishermen leave it alone because its lack of nutrients makes it an oceanic desert. This area includes the "horse latitudes," where stock transporters in the age of sail got stuck, ran out of food and water, and had to jettison their horses and other livestock Surprisingly, this is the largest ocean realm on our planet, being about the size of Africa—over 10 million square miles. A huge mountain of air, which has been heated at the equator, and then begins descending in a gentle clockwise rotation as it approaches the North Pole, creates this ocean realm. The circular winds produce circular ocean currents that spiral into a center where there is a slight down-welling. Scientists know this atmospheric phenomenon as the subtropical high, and the ocean current it creates as the north Pacific central or sub-tropical gyre. Because of the stability of this gentle maelstrom, the largest uniform climatic feature on Earth is also an accumulator of the debris of civilization. Anything that floats, no matter where it comes from on the north Pacific Rim or ocean, ends up here, sometimes after drifting around the periphery for 12 years or more. Historically, this debris did not accumulate because it was eventually broken down by microorganisms into carbon dioxide and water. Now, however, in our battle to store goods against natural deterioration, we have created a class of products that defeats even the most creative and insidious bacteria. They are plastics. Plastics are now virtually everywhere in our modern society. We drink out of them, eat off of them, sit on them - even drive in them. They're durable, lightweight, cheap and can be made into virtually anything but it is these useful properties of plastics that make them so harmful when they end up in the environment"

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