Ships are a huge source of ocean pollution, and so is runoff. Runoff comes from nearby factories or hospitals that carelessly dump nasty things into neighboring rivers. Because rivers are made of water, and water tend to be affected by gravity, the rivers carry all of those nasty things into the oceans, where they will fester forever and eventually kill everyone.
Food/Ag Study Guide 11:
Overharvesting of aquatic animals for food isn't good, because eventually humans will become so populous that feeding all of the fat people in the world will require species of fish to become completely wiped out. Then the entire food chain as we know it will collapse and Earth will cave in on itself and disappear from the universe forever.
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