Charles Moore, founder of the Algalita Marine Research Foundation, tells us far more than we may want to know about how plastics are devastating our oceans.
We cannot at this point in time repair the damage already done. What we can do is stop creating more ocean destruction. Go to Plastic Garbage Patch.

Hyberbolic
The reason that they don't show pictures of the Pacific ocean's "garbage patch" is because it doesn't look like much. Yes, a few pounds of garbage fetch up here and there but even Captain Moore says that it's about 17 milligrams per square meter. A 2.5 gram bottle-cap uses up the quota for 138 square meters, an area that if square would be 11.7 meters or about 38 feet on a side. The Wikipedia entry says about three flakes per square meter weighing an average of about 5.1 milligrams each, so what you have is three flakes on a square yard of ocean surface that you have to use a magnifying glass to see. There is no way to photograph that and make it look like a "garbage patch."
www.animalculture.org