I got my copy of Thomas Moynihan's X-Risk: How Humanity Discovered Its Own Extinction in the mail today. I may start reading it soon.
Here are a few things I'm interested in from this book: 1) general intellectual history; 2) the history of existential risk; 3) a chance to meditate on history / civilizational development in general; 3) a chance to meditate on existential risk; 4) engage with Moynihan's "seeing existential risk is a sign that we are mature" idea.
I don't think I'll try to read it twice, unless it seems like a good idea once I get through it once. It's a history book and not a philosophy book.