With Venus, they wanted the CO2 to freeze because they wanted to sequester it. They had plenty of ability to fine-tune the temperature of the planet to whateve

With Venus, they wanted the CO2 to freeze because they wanted to sequester it. They had plenty of ability to fine-tune the temperature of the planet to whatever they wanted, and indeed they do so over the course of the book. It's obviously fatuous to suggest that, oh no, 4 degrees of global warming is a huge problem but also, given the ability to finely control global solar influx with essentially infinite variability (they are, after all, suggesting that they'll use their sunshade to give Venus a day-night cycle, so they can open and close the damn thing every 24 hours indefinitely), you can't find a solution to Earth's global warming problem that's better than four degrees of global warming. A perfect solution? Perhaps not! But better than their status-quo. And what was their amazing solution? Literally air-drop animals everywhere. Think that might have some unintended consequences? The whole thing was absurd. KSR seemed to have no ability to stitch together terrestrial problems that were plausible within the framework of the rest of his solar system.