One of the joys of speculative fiction is exploring interesting ideas via story, and Cadman's The Changes: Trilogy is an epic story.
Managing to juggle and weave multiple narratives and timelines over a stunning 100,000 years (Earth time), using the same core cast, is quite an achievement, and humanises the themes Cadman explores.
Though the 'changes' largely relate to anthropogenic global warming, it's more than cli-fi, as Cadman insists on a realistic time-frame for restoration of Terran climate to pre-anthropocene standards, and thus gives him, and us, a chance to explore issues of what makes us human - individually and collectively, and what makes humans as a species so fated to destroy the planet we live on. I'll avoid spoilers, but Cadman's Earth 100k years on, contains sentients other than homo sapiens, and for that reason alone offers potential solutions and hope.
Bottom line: an adventurous rollercoaster with big ideas and characters to care about.