And the utterly peaceful sentient species that evolved there??? Errr, evolution does not work that way.

I'd have to go back and review to find all the other guffaws I had when I read it. But for every "ah ha!" that one of the genius scientific detectives had, I had 2 or 3 "oh come on"s.

Oh wait I'm starting to remember that he had a lot of material on CO2 that was really silly. And evolving immunities to poisons that are so potent that there can be no immunity from them... I'm pretty sure I'm getting some of this wrong because it has been too may years since I read it.

Oh yeah, the big bad human villains were so stupid that L. Ron Hubbard could have invented them.