I thought that was actually the point of the article. The author freely admits that from a human perspective, climate change and habitat destruction and the bleaching of coral reefs are a big deal. The point he's making is that from a planetary perspective, humans are insignificant. Indeed, from a planetary perspective multi-cellular life is insignificant, and life at all is a minority.

The thing is that much of the debate over global warming has been framed in planetary terms. If you frame it in human terms, you already have a good argument: climate change will cause mass migrations, historically mass migrations have caused massive wars and the collapse of civilizations, I don't want to die in a war while my whole civilization collapses, ergo it's probably a good idea to solve or at least adapt to this climate change thing before shit hits the fan. But if you frame it in terms of "climate change will make the earth uninhabitable" or even "climate change will lead to the extinction of humanity", a.) you're probably wrong - our species is remarkably resilient, and we have lived through large planetary-scale shifts in the earth's climate b.) the earth has been made uninhabitable to much of life in the past, and yet we're here and c.) so what, we'll all be dead.