Scientist Jan Czerny throws a hauling line to his colleagues, while retrieving the nine mesocosms (experiment water enclosures) from Kongsfjord after five week long ocean acidification experiment has been completed successfully. Greenpeace has worked with a team of scientists from the German marine research institute IFM-GEOMAR to investigate ocean acidification, by deploying nine large mesocosms. Ocean acidification is a phenomenon caused by carbon dioxide (CO2) emissions that has just as much potential to damage marine ecosystems as climate change. Absorption of excess CO2 pollution by seawater causes its PH level to drop, making it more difficult for calcifying creatures integral to the marine food web to form shells and skeletons.more difficult for calcifying creatures integral to the marine food web to form shells and skeletons.