Labels:bulletin board | reckoner OCR: One hypothesis suggests that increased nutrient runoff from the continental shelves that were exposed as sea levels fell fertilized phytoplankton This nutrient input could have created larger biomass of such marine species Because the calcium carbonate shell makes up most of the mass of many phytoplankton species, increased productivity would remove carbon dioxide from the oceans and eventually the atmosphere At the same time, boreal forests that account for about 10 to 20 percent of the carbon ir the atmosphere were decimated during the ice ages Carbon from these high-latitude forests could have been released to the atmosphere yet the atmosphere had less of this gas then Thus the positive feedback system of the ocean's biological dund may have offset the negative feedback caused by the de ...
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