Mongabay: A controversial ‘ocean fertilization’ experiment suggests seeding the seas with iron to boost carbon-absorbing phytoplantkon will not sequester much carbon dioxide from the atmosphere. Some — including researchers and private companies — had hoped iron fertilization might be an easy fix for climate change. The Lohafex experiment, conducted by Indo-German team of scientists from the National Institute of Oceaonography and the Alfred Wegener Institute earlier this year, dumped 20 tons …