Walk the Vanished Earth

A novel which starts off with wildly different threads, a 19th century Buffalo hunter and two non-humans and a girl on Mars. The book slowly bring threads together: a familiar and well-liked mechanism, done nicely here. The author cobbles together several tropes (a huge debt is owed to Frederik Pohl, Man Plus) but much of whatever science there is, is very iffy, e.g. the effect of global warming is only sea level rise. The big positive is the bringing together of seemingly irrelevant stories, an old trick but well done for a first novel. But, honestly, there are also better novels out there, this year, with the same themes and ambiance.