> Geoengineering. I know that if they won’t do it someone will.

that's true for any terrible idea. in many way's terrible ideas is how humanity progresses. but it seems bad to double down on the same old ("more engineering") to solve the problem. Guess the alternative "spend less" is very unpopular because it's something anyone can do but it actually hurts.

Do you even know what you're talking about? Are you referring to iron rust being randomly distributed in the ocean or along the coast? All that will do is cause an algal bloom and die off, killing off even more of the depleted marine life. That won't sequester any carbon, at best 0.05% if you do it in a way that forms the sediment. Otherwise, you're just killing what little marine life is left for giggles.