We don't have the time to sit back and let epistemic knowledge wash over us. We know more or less what needs to happen (less sunlight in, more heat out). All attempts to resolve the situation require taking some risk, and it'll be impossible to quantify all those risks until we try them.

At the risk of stating the obvious: we need to measure every weird idea we try, and do our best to isolate the variables. Easier said than done. But we broke it, it's our problem now.

Talking about humility: an excess of humility leads to fatalism. Some is good, but not too much if you want anything to happen. We're talking about fixing the ecosystem of a planet, of course it's ambitious.