The author uses three critical numerical measures to frame his well thought out argument that we are in deep doo-doo. Because he seems very pessimistic about the future, this is not uplifting reading.
Since I wrote one of the first books for a general audience about global warming way back in 1989, and since I've spent the intervening decades working ineffectively to slow that warming, I can say with some confidence that we're losing the fight, badly and quickly – losing it because, most of all, we remain in denial about the peril that human civilization is in.All the blame for this seems to be the fossil fuel industry. If only they would behave better! Thus, fundamentally this astute environmentalist and product of capitalist informed education can only see this as a moral issue.
Climate change operates on a geological scale and time frame, but it's not an impersonal force of nature; the more carefully you do the math, the more thoroughly you realize that this is, at bottom, a moral issue; we have met the enemy and they is Shell.