The last time I heard this story the great swath of plastic was estimated to be the size of Texas. The latest news is that there is what is describes as a "soup" of mostly plastic garbage twice the size of the United States in the Pacific Ocean. From the Independent (UK):
"Plastic is believed to constitute 90 per cent of all rubbish floating in the oceans. The UN Environment Programme estimated in 2006 that every square mile of ocean contains 46,000 pieces of floating plastic..."
I'm just so proud I could cry. It's too late to be elected as a wonder of the world, but this is more impressive than all of them combined.
(creative commons attributed photo from Flickr user ntr23)