There is only one relatively easy, safe, cheap and responsive way of reducing atmospheric CO2 left to us: oceanic seeding with iron. Phytoplankton represent 80

There is only one relatively easy, safe, cheap and responsive way of reducing atmospheric CO2 left to us: oceanic seeding with iron. Phytoplankton represent 80% of the carbon cycle, in terms of converting CO2 to O2. Problem is, they are resource-constrained via a lack of iron in the water. Seeding the oceans with iron is easy and cheap - we already have all the tools to do so, and almost all are last century’s tech. It would be as simple as flying slightly-modified retired airliners a hundred meters over the ocean, out and back again, while releasing the dust. Seeding the oceans with iron is safe - it has been done before, and the only known knock-down effect has been a massive increase in the health and fecundity of the entire oceanic food chain (salmon runs for the following three years were the largest in the prior half century). Seeding the oceans with iron is responsive - unlike almost any other form of terraforming, iron seeding needs to be done constantly, as the life cycle of phytoplankton is so darn short. The iron either gets recycled very quickly, or ends up descending into the benthic layer when the phytoplankton die without getting eaten. Any seeding program can literally stop on a dime and go back to zero effects in less than three years - a blink of an eye, geologically speaking - if something negatively unexpected starts happening as a direct response to the seeding. No other terraforming method has this level of ease, safety or responsiveness, making it the most appropriate method to use on our home directly. And with 80% of all oxygen transpiration is done by phytoplankton in the oceans, we ALREADY have the largest oxygen-sequestration machine at our fingertips. We don’t have to build it. Why are we not maximizing its effectiveness?