Given are the two pie charts illustrating the proportions of seven different pollutants, namely: domestic sewage, offshore oil, marine, industrial waste, farm waste, litter, and pollutants from air, entering a particular part of the ocean over a 20-year period, between 1997 and 2007.
Overall, it is evident that the data reflect a wide discrepancy in which pollutants from air took the dominance, and the opposite was true for litter. Also, domestic sewage, along with offshore oil, experienced a remarkable growth, while the others exhibited a downward trend throughout the period surveyed.
According to the pie charts, pollutants from air, and farm waste increased slightly by 1% and 2% to 29% and 2%, respectively, over the period. Similarly, marine and industrial waste witnessed a noticeable and considerable increase by 5% and 8% from 22% and 17%, separately. Additionally, litter started with the lowest percentage at 4%, declined markedly, disappearing from the charts in the final year.
In contrast, the period observed a substantial rise in the percentages of contaminants. Particularly, the figure for domestic sewage increased dramatically by more than, from 18% to 29%, peaking at the same proportion as pollutants from air, the highest share. In addition, there was a significant growth in the percentages of offshore oil, tripled from 5% to well under 15% over the period.