The pie charts compare the proportion of pollutants of a certain ocean region by seven materials in 1997 and 2007.These include pollutants from air, litter, farm waste, industrial waste, marine, offshore oil, and domestic sewage.
Overall, pollutants from air account for the largest share of the entire pollutant mixture in 1997 and share the stage with domestic sewage in 2007. In comparison, most of the categories show a downward trend in 10 years, except for domestic sewage and offshore oil. Litter illustrates a dramatic drop by being null in 2007.
Domestic sewage and air pollutants comprised almost half of the total pollution in 1997 and rapidly increased to nearly 60% in 2007. A sharp 11% climb was seen in domestic sewage, while the airborne pollutants approximately remained the same. In 1997, 5% of the pollutants thrown in the ocean were offshore oil. This figure became 14%, almost increased threefold in 2007, making it the second-largest pollutant.
In contrast, wastage from litter, farm, industry, and marine decreased from 4%, 4%, 17%, and 22% in 1997 to 0%, 2%, 9%, and 17% respectively in 2007.
In summary, while most pollutants led to less damage than before, air pollution and domestic sewage were substantially affecting the ocean.