Solar geoengineering rests on a simple idea that it is technically possible to make the Earth a little more reflective so that it absorbs a little less sunlight, which would partly counteract some of the risks that come from accumulating carbon dioxide in the atmosphere. When I say technically possible, it appears that at least doing this in a crude way is actually easy, in the sense that it could be done with commercial off‐the‐shelf technologies now, and it could be done at a cost that is really trivial, sort of a part in a thousand or a part in ten thousand of global GDP.
At that moment when everybody is suddenly caring about this stuff, that’s the moment at which nihilism can be averted. It’s the moment in which nihilism must be averted if you’re going to make a change. Peak indifference is the moment when you stop convincing people to care about an issue, and start convincing them to do something about it.