The pie chart below shows information about different types of pollutants entering in a particular area of ocean in 1997 and 2007

The two pie charts compare the pollution of a particular area of the ocean in 1997 and 2007.

Overall

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, it can be seen that in both years the most significant reasons for contamination were domestic sewage and pollutants from the air

while

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farm water and litter had minimal effect on the environment. In terms of pollutants, it had minimal changes over the ten years period, from 30% to 33%.

Next,

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the most harmful effect on the ocean had domestic sewage, with 18% in 1997 and 32% in 2007. Marine transport waste had 22% in 1997 as opposed to in 2007 where it represented 8%. With

regards

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to the remaining reasons for contamination, there was a considerable change in offshore oil from 5% to 15%. Meanwhile, industrial waste decreased from 17% to 10%.

Finally

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, pollution of litter disappeared in 2007,

although

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in 1997 it accounted for 4%.