The pie charts compare the proportions of pollutants accessing a special area of ocean in 1997 and 2007.
Overall,it’s clear that pollutants from air was thirty percent, which account for the most in the percentages of pollutants in 1997. By contrast, litter and farm waste have the identical amounts, which is the lowest at four percents. Marine waste have 22%, which was ranked second. Furthermore, pollutants from air and marine waste were accounting for half of the pie chart in 1997.
It is noticeable that domestic sewage was sharply rising up at 29%, and litter from 4% to 0%, which was slightly reduce to zero. Additional, farm waste and industrial waste were 2% and 9%, respectively. Especially industrial waste had considerably drop from 17% to 9%. But, offshore oil had a dramatically rise from 5% to 14%.
In conclusion, there were a largely evolve in the pie charts from 1997 to 2007. Until 2007, pollutants from air had a slowly decline.