I didn't come across any evidence in this chapter that was particularly compelling or irrefutable.
Kolbert shows that the behaviors and locations of butterflies, mosquitoes, and frogs are changing, and that Darwin believed that these sort of changes in species were a result of climate change. So what? This is all speculative and circumstantial evidence for the big, bad global warming that Kolbert is trying to prove.
Just because the climate may be changing and affecting various animals, does not mean that it will be catastrophic (especially since it has happened before), and it certainly doesn't mean that it is the fault of the human race.
Kolbert also makes an effort to convince her readers that climate change will wipe out many of the Earth's species. Again, the evidence she provides of this is simply the speculations and worst case scenario theories of researchers that Kolbert came to trust because she found them quirky and endearing.
Kolbert has offered a possible scenario for the future; however, she has offered no evidence that it will necessarily happen, and given no compelling reasons to suggest that her proposed scenario is any more likely than another scenario.
When I first started the book I enjoyed Kolbert's anecdotes, and inclusion of excess information, but at this point I'm sick of it. It's annoying to have to read pages and pages of babble just to get to the point. If I were interested in the camouflage of butterflies and mating rituals of frogs, I would read a book devoted to that. It is also hard to keep up with Kolbert's impromptu changing of topic. I think she has severe and untreated Attention Deficit Disorder.