So his answers for both, basically: maximalism. The point he's sort of making is that making the planet safely inhabitable is going to take every tactic and every ideology not necessarily working together but working on some piece of the thing. No one actor gets to be the hero (though I do enjoy that KSR's favorite kind of protagonist remains the middle-aged competent lady technocrat–guy's got a type) and while he's sort of indicating that capitalism as we know it has to die, he's not saying that happens through inevitable worker uprising. Some of it's coercion of central banks and some of it's straight-up guerrilla terrorism. Geoengineering happens at varying scales for better and for worse. Massive economic collapses occur. Millions die. And the point I think from KSR is that's the outcome in his most optimistic take. In general with KSR I don't know if I ever fully agree, but I always feel fully engaged.

This is also probably the most not-novel-y of his novels in that there's a couple of recurring characters running through the book but a ton of it's just first-person unnamed narration of events happening around the world. Someone describing a drought, a refugee describing a camp, a miner describing the nationalization of his mine. One very weird and fun chapter from the point of view of actual carbon.