What have been some of the causes of the increased amount of oil found in the ocean? What is the largest source of additional oil?
· Oil has always been naturally present in the ocean, but it has been on the rise.
· More than half of the world's oil is transported on the ocean each year. Since the increased transportation has occurred, there have been oil spills in the ocean. They are not always large enough to warrant the news, but this is not the main source of increased levels of oil found in the ocean.
· Some oil is released during the loading, discharging, and flushing of the tanker ships themselves. This accounts for 8% of the oil in the ocean.
· Most of the oil that gets added to the ocean each year comes from the runoff of city streets. This is perhaps the most dangerous addition of oil to the ocean. The oil has carcinogenic properties in this form.
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