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Source: IPCC, 2001.
Uploaded on Tuesday 21 Feb 2012
Riccardo Pravettoni, UNEP/GRID-Arendal
Living systems play a vital role in the carbon cycle. Photosynthesising organisms – mostly plants on land and various kinds of algae and bacteria in the sea – use either atmospheric carbon dioxide or that dissolved in sea water as the basis for the complex organic carbon compounds that are essential for life.