Hi, just wondering what peoples views were on something I just heard about. I had previously heard of a theory that ran along the lines of: If you scatter a whole lot iron dust on the surface of the ocean you will allow the phytoplankton to use it as a nutrient and cause them to rapidly multiply and form a plankton bloom. This efffectively absorbs carbon dioxide into organic form, offsetting carbon emmisions. You can then trade the carbon credits to companies that release CO2. Now I understand that a company called Planktos is going to spread about 100 tons of iron sulphate over about 10,000 square Km of the pacific ocean to do just this (well I think in this case they're trying to prove the commercial viability of the idea). Needless to say this has caused a strong reaction from various environmetal groups (and incidentally the US EPA) and various claims and counterclaims are being thrown round left right and centre, probably veering further from the truth as they go. One I thought I'd specifically mention was from the company and they said that oceanic plankton levels in many places had dropped about 50% in the past few decades so what they were doing would only push the levels back up to where they should be. Does anyone know if there is any truth to that? So, what are peoples views on this? I know little about phytoplankton population dynamics and the flow on effect on the surrounding ecosystem, etc and I don't like to make instant decisions on whether to be for or against things so I'm interested in others thoughts.