The two pie charts illustrate how different pollutants entered a specific part of the ocean between 1997 and 2007.
Overall, at the beginning of the period litter and farm waste contributed the least to the ocean, while air was the most significant of the sea. In comparison, at the end of the period, domestic sewage and air became the largest segment and the lowest contribution was made by farm waste.
More specifically, the proportion of pollutants from domestic sewage increased slightly from 18% to 29% during a period of 10 years. From 1997 to 2007, there was slow decline in the percentage of air pollutants around 30% to 29%. The proportion of offshore oil rose significantly from 5% to 14% over the period.
In 1997, the litter of pollutants was 4%, and had a slow decline of 0% in 2007. Throughout the period from 1997 to 2007, the rate of farm waste fell minimally about 4% to 2%. There was a slow fall in the percentage of marine from 22% in 1997 to 17% in 2007. The proportion of industrial waste decreased moderately approximately 17% to 9% over the period.