If we wanted to actually solve climate change it would be trivial. Oceanic iron seeding would suck all of the carbon dioxide out of the atmosphere and it would cost only a couple of billion dollars. And then plants would wither and die and the world would end.

Of course we could do it in small doses over a couple decades for proper regulation and not a Snowpiercer scenario but as with most problems the efficient solution does not line their pockets so they're not interested in it.