Emissions of CO2 from the burning of fossil fuels have increased with more than 1200 % over the last 100 years. Increasing levels of CO2 in the atmosphere do not only contribute to warmer climate, but CO2 is also taken up by the oceans and changes their chemistry. The oceans have absorbed approximately 50% (ca. 525 billion tons) of the carbon dioxide (CO2) released to the atmosphere since the beginning of the industrial revolution. When carbon dioxide is absorbed by the oceans it reacts with seawater to form carbonic acid.