Not to trivialize this issue, but the perception that the media presents doesn't match reality (surprise!). emph mine
https://en.wikipedia.org/wiki/Great_Pacific_garbage_patch
So let's apply some good old fashion 'rithmetic.
a Metric ton is ~ 2200 pounds, trillion is 10^12, so....
176,000,000 pounds of plastic in the Great Pacific Garbage Patch
1,800,000,000,000 pieces of plastic in the Great Pacific Garbage Patch
Divide, very small number... multiply by 16 to get ounces, and...
The average weight of each plastic piece is 0.001564 ounces. Maybe easier to visualize, it would take 639 of them to make up an ounce.
Again, this is not to trivialize the issue, those small particles can cause problems. It is just to put some this media stuff into perspective.
-ERD50