Ran out of steam re-reading the whole enormous Mars trilogy on page 238. By my records I only read this volume once before, in 1996. Skipped to the last paragraph, which was beautiful and I find I want to get all the way from pp 238 to the end again, perhaps in a month or two (but need to read something different now).

The big surprise rereading this is I had misremembered the flooding as being caused by global warming, but no, it's a random ice sheet disaster! Also, much more Swiss stuff than I had remembered, including
some chapters set in Switzerland. (Perhaps I noticed this more having recently been there myself?)