Well, one of the biggest threats right now are garbage patches, like the one in the Pacific Ocean. The Pacific garbage patch is twice the size of Texas and is responsible for the deaths of about100,000 marine creatures and 1,000,000 birds each year.
Another threat is runoff pollution; 80 percent of pollution in marine environments comes from land-based sources. Runoff pollution has sources such as septic tanks, cars, trucks, boats, as well as farms, ranches, and forests. Motor vehicles also produce small (on the order of a drop) oil spills onto roads and parking lots, which can contribute to runoff pollution. Air pollution can also settle into waterways and oceans, and top soil or silt from fields or construction sites can also enter waterways and damage fish habitats.
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