By Leo Hornak
"A recent claim that there will be more plastic than fish in the sea by 2050 was intended to highlight a pollution crisis in the oceans. The problem really does exist, but do the figures hold water, or is there something fishy going on?"
Seems it's possible there'll be more of both, bearing in mind that plastic doesn't decay quickly - if at all, and fish populations could possibly increase - though dead fish do eventually decay, and do so fairly quickly, I'd guess. Numbers aside, contamination will continue for centuries, should humans survive long enough to monitor such things.