Green's books always leave me feeling a little more hopeful. His wit and lyricism are even more evident in essay form than in a novel. There are as many funny, wacky facts in this book as you would expect from a celebrity nerd.
My only criticisms are that for a book that claims to review the Anthropocene it is obscenely American in perspective (despite a couple of essays being on non-American topics/stories); and that, if you've followed John Green for a few years, even if you don't listen to the Anthropocene podcast, a lot of these stories will be at least familiar to your ears.