The only type of geoengineering I would endorse without much hesitation is sucking CO2 back out of the atmosphere. But I don't think that the weather system is

The only type of geoengineering I would endorse without much hesitation is sucking CO2 back out of the atmosphere. But I don't think that the weather system is sensitive enough that we can't try nudging it with measures that are easy to stop and whose effects only last a couple of years (e.g. injection sulphur into the atmosphere).