Ocean acidification is the name of the continual decrease in the pH of the Earth's oceans. The pH levels measure how clean the oceans are. This is caused by the increase of human activity. In other words, its due to our increase in pollution.
Between 1751 and 2004 surface ocean pH levels are estimated to have decreased from approximately 8.25 to 8.14. The land activity by humans has the combustion of fossil fuels have led to a new flow of CO2 into the atmosphere. Some has gone up in the air been taken up by terrestrial plants, staying in the atmosphere, but some of it has also been going in the oceans causing it to be polluted. This also leads to the decrease in the pH levels.
Website: http://www.sciencedaily.com/articles/o/ocean_acidification.htm
Picture: www.co2science.org
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