As the climate changes, researchers are worried that the composition of the ocean is also changing. When the climate changed dramatically thirteen million years ago, so did the chemical make up of the ocean. As the weather got colder, ice sheets grew which led to a drop in the sea level. Not only was the climate changing, but so was what the rivers dropped into the ocean. Research has shown that as the climate got cooler, the amount of calcium found in the ocean increased. An increase of calcium changed the acidity of the ocean which in turn affects all chemical and biological reactions occurring in the ocean. Researchers are working hard to determine if the current climate change is having similar effects.
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