Once again, I'd like to underscore one one comment that Peter made about policy experimentation. I'm not really in the hook business myself. But there is one chapter in the volume of written by Eileen Grable, and she very much influenced by Hirshman that, as Peter invoke, emphasizes that one consequence that is actually positive of perhaps an erosion of an American order is creating the space for policy experimentation, which she thinks will lead to a variety of possibilities that might not have otherwise taken place. As for pessimism, I'm much more at home in that area. And my own view is high from the obvious climate crisis that again, Peter invoked my own greatest current concern, and I think it will affect the nature of international politics. And of course, domestic politics, is this generalized global rise of personalist authoritarianism, it's shocking to me. But it is, I think, a dangerous phenomenon and not easily explained, again, to my eyes. But it is it is not something we just see in the United States. It's something we can see on every continent, in which many parties seem to be turning to very strong and often authoritarian leadership. And I think that this will be something that defines the emerging pattern of international relations, and not for good, but I do so that is the thing that probably concerns me the most, acknowledging the fact that of course, climate change represents a global looming catastrophe that we need to reckon with. But as a kind of political scientist, I do think this phenomenon is the one that I find very disturbing. And you can even see it within authoritarian states, right? So they weren't democracies. But even some non democracies have transition towards an even more kind of ruthless form of personalist authoritarianism, that has the support of a lot of people within their societies. And this, I think, is not a good recipe for world politics. And also, it's rather incompatible with my own personal preferences.