Why don't we just gather up all the ocean's trash and all the nonrecyclables, put them in a rocket, and launch it into the sun?
I'm sure there's a perfectly good reason why we haven't done this yet. Too expensive? Would launching it into the sun cause the smoke (if there is even smoke in space) to find its way back to Earth, therefore polluting the air?
The short answer is just that doing so would be ridiculously difficult and expensive. Funnily enough, "launch it into the sun" is actually the easy part at this point. If we could collect all of the ocean's trash, we probably would have done so and compressed it by now.
I love the optimism here, but unless there was a significant potential for profit, none of the people who have the resources to begin collecting ocean plastics could care less.
The sad truth is that the majority of the world's resources are owned and controlled by a handful of psychopaths.