The two pie charts below show the pollution entering a particular part of ocean in 1997 and 2007 v.2

The two pie charts above describe the changes in the proportion of contaminants inpouring into a specific ocean area in 1997 and 2007. It is clear that atmospheric pollutants were the main pollutants over the decade, accounted for about 30% in 1997 and 29% in 2007. Besides, the charts reflect an upward trend in the percentage of domestic sewage and offshore oil, rose from 18% to 29% and 5% to 14% respectively. By contrast there was a fall in the figure of the other four contaminants over the 10 year period. The level of pollution caused by marine and industrial waste witnessed a dramatic decrease, from 22% to 17% and 17% to 9% separately. Moreover, agriculture waste stayed significantly small ratio of the total amount pollutants, made up 2% in 2007. And the litter completely disappeared in the particular ocean area. Overall, the government should pay more attention to supervise the sanitary sewage and offshore petroleum pollutants in order to preserve marine environment.