These pie charts describe the percentage of polluted ocean area in 1997 and 2007. The parts are measured in percents.
Overall, it can be seen that in 1997 were slightly more sources of pollution, while, in 2007, this number decreased, but those which remained grew dramatically. The largest pollution was made by pollutants from air.
Moving to a more detailed analysis, it might be seen that domestic sewage and offshore oil level had an upward trend, increasing for nearly 10 percent. On the other hand, marine, industrial waste, and farm waste had a dawnward trend. Their reduction fluctuated from 2 to 8 percent. Moereover, litter pollution was reduced to 0 percent in 2007. Also, important to mention that pollutants from air remained stable fron 1997 to 2007, reaching nearly 30 percent.
