Over many decades, the human race has overfished key species to near extinction, and polluted the oceans with carbon dioxide emissions, toxic chemicals, garbage, and discarded plastics. This passage tells us all about our mistakes towards ruining the ocean.
Like how global warming affects the fish by making swim to cooler areas of water, and coral reefs more vulnerable to bleaching. We also have ruined the ocean by throwing waste, such as plastic into the waters. When we do that, fish could get stuck in it, or could eat it by accident. Because we have done this, there is no actual was to clean all the waste out of the water. It would take almost a year to clean up 1% of the waste, as it is growing more rapidly.
Overfishing is another big problem. Most commercialized fish have gone down by 75%-99%, and cleaning out waste, would just lower the population of sea life. This is how we humans are ruining the ocean.