I happily defer. I've reread the trilogy 6 times now and they do all blur together a bit.

You look to be right:

https://www.kimstanleyrobinson.info/content/space-elevator

And I'm not the only one to notice the cross-reference:

https://www.reddit.com/r/kimstanleyrobinson/comments/pv6zh9/...

There's a terrorist attack, sorta, in latter book, but Red Mars was admittedly a legitimate military strike, as was destruction of Phobos.