Ocean fertilization is a type of geoenginerring involving the addition of limiting nutrients to ocena surfaces with the goal of increasing phytoplankton productivity, which may take up and store some of the excess carbon dioxide building in the atmosphere.  While it has the potenital to help mitigate climate change it also risks damaging ocean ecosystems.  The US Ocean Carbon and Biogeochemistry Program recently released it’s report of the un-regulated ocean fertilization experiment conducted by a private company off the Pacific coast of Canada this summer, which dumped 100 metric tons of iron-rich dust into the ocean in an attempt to earn carbon credit funds.  The report summary is available here: http://www.whoi.edu/fileserver.do?id=136984&pt=10&p=39295