[mirimir]

We may well be forced into geoengineering. Because, by the time enough people/firms/governments are sufficiently motivated, it'll be too late for anything else. Except adapting, I mean. But anyway, CO2 capture is the obviously safest bet. Adding shitloads of iron to the oceans, or injecting shitloads of SOx into the stratosphere, are just a little too likely to have serious downsides. Or putting screens at L1, for that matter.

[quotemstr]

I like the L1 screen idea. It's quickly reversible, after all. Besides, in the long run, if we're going to because a Kardashev type I civilization, we're going to need some kind of planetary energy management. Why not start now?

[lstodd]

The screen itself can be quickly removed, yes.

But will the effects of it being there for some time be also temporary? No one can say.

edit: better phrased as

On what timeframe the negative effects of a temporary screen will revert?

[zeth___]

The down side of this is that once carbon capture becomes viable the amount of CO2 Canada and Australia want in the atmosphere are very different.

Should Canada take it as a declaration of war if Australia starts a program to reduce CO2 to 150 ppm?

[mirimir]

That is an interesting question.

By then, it seems likely that Canada will be part of the US. Or at least, that the northern US and Canada will have merged. And impacts do seem horrible for Australia.

But damn, war over atmospheric CO2 management. What a trip.