Projects suggested to avoid climatic changes engendered by human activities and in particular the increase in CO2 in the atmosphere include dispersal of sulfate particles in the stratosphere to reflect sunlight and fertilizing the southern oceans with iron to stimulate phytoplankton growth. It is believed that low levels of iron limit the biological productivity of nutrient-rich southern oceans. Adding iron to these waters would increase the growth of phytoplankton, thus reducing CO2 levels in the seawater and thereby altering the CO2 balance between seawater and the atmosphere. What do you think of each suggestion?
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