I actually think you can trace many many of these big systemic crises to being symptoms of the flawed idea that economic growth can go on indefinitely, exponentially, on a finite planet. That’s sort of my North Star. And then as a finance person, why do we think we need economic growth? Well, because the way our capital system works is that capital demands that growth.
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.