It's a book about the potential effects - based on current models of several scenarios - of long-term climate change. In other words, 'low'-growth situations and extreme cases are compared for ocean acidification, sea-level rise, human interruption of species migration, etc. over thousands of years, but it also keeps in mind the next few centuries to give a somewhat human reference point.
The author is a geologist, the research is extensive, and the science is, of course, always being updated, but it could only be considered 'preachy' if a reader already did not 'believe' in climate change.
Ultimately, the author shows how all of the predicted changes have happened before without human interference, but that humans have sped up and overblown the natural system to the level of a natural global disaster. We're in it for the long haul now and probably will skip the next ice age due to warming (which has also happened before.) However, 'happened before' doesn't mean it won't fundamentally change our way of life for millennia to come. The temporal scale makes it easy to ignore, because few people care about the future beyond their grand children, but it's food for thought and a call to keep to a low-scale expansion of emissions and to avoid ill-informed proposals such as carbon sinks in the ocean.
TL;DR - yeah, it's good.
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