I think we have reached the limit for how much we should “improve” and replace nature, if there’s no room for trees we should make room instead of accomodating yet another industrial solution to a problem created by industry in the first place.
Too expensive to grow trees? Thank god capitalism is saving us so much money, we are all so rich now that we can simply buy oxygen tanks instead of having to deal with those money sucking trees and plants.
Sadly, dealgaeation is quickly becoming a catastrophic problem. However, we are confident we can soon genetically modify human lungs to partially breathe the sulphur clouds that will engulf our planet!