The two pie charts illustrate the sources of pollution entering a specific section of the ocean in 1997 and 2007.
Overall, pollution from domestic sewage and offshore oil increased over the ten-year period, while contributions from other sources such as litter, farm waste, industrial waste, and marine waste decreased.
In 1997, domestic sewage made up 18% of the total pollution, rising significantly to 29% in 2007. Pollution from offshore oil also increased, from 5% to 14%. Airborne pollution saw a slight decrease, falling from 30% to 29%.
In contrast, industrial waste accounted for 22% in 1997 but dropped to 17% in 2007. Marine waste also declined significantly, from 17% to 9%. Pollution from farm waste was halved over the decade, falling from 4% to 2%. Notably, litter, which contributed 4% in 1997, disappeared entirely by 2007.