As I understand it, algae growth is generally limited by iron, so just removing the limiting factor can increase growth and pull more CO2 out of the air. There

As I understand it, algae growth is generally limited by iron, so just removing the limiting factor can increase growth and pull more CO2 out of the air. There has been at least one rogue geoengineering project along those lines - https://csi.asu.edu/ideas/the-first-of-the-geohackers/ https://csi.asu.edu/ideas/the-first-of-the-geohackers/ Maybe we don't actually need genetic engineering - maybe we can just build big algae ponds and feed them iron supplements. Basically build algae heaven, open source it and random groups across the globe can start doing it.