It's true that every nation dumps its cr@p into the ocean (there's only one -- it's all connected).
But the ocean is more vast and resilient than you or I can comprehend. For all of Earth's history, the ocean has accepted and dealt with all manner of biological excreta and chemical pollutants, dead animals and gigantic algae mats, not to mention toxins from underwater and land volcanoes, landslides, etc. All of it is bio-degraded, consumed, or eventually breaks up and sinks to the bottom. Those processes have been going on successfully for hundreds of millions of years -- if they didn't work, we wouldn't be here.
So yeah, humans dump a lot of cr@p into the ocean, and it contributes to the overall mess.
But "destroying the planet"? Hardly. Earth barely knows or cares that humans exist. We are a temporary biological blip, and our superficial surface damage will disappear shortly after we're gone. Even plutonium degrades eventually, and its half-life is negligible compared to the life-cycle of the Earth.
The most we can do is make ourselves uncomfortable in the meantime, and we are doing a good job of that. But truly, Earth does not care, and will easily erase our cr@p once we have passed into oblivion.
you can also pee in your pool and it will be fine as long as you keep cleaning it, but that does not make it wise.
and I believe that the fault of modern science is that it assumes that the activities of man are not a part of nature and it gets hijacked by politicians who use it for power