Some scientists, Guy McPherson included, fear that climate disruption is so serious, with so many self-reinforcing feedback loops already in play, that humans are in the process of causing our own extinction.

August, September and October were each the hottest months ever recorded, respectively. Including this year, which is on track to become the hottest year ever recorded, 13 of the hottest years on record have all occurred in the last 16 years.

Coal will likely overtake oil as the dominant energy source by 2017, and without a major shift away from coal, average global temperatures could rise by 6 degrees Celsius by 2050, leading to devastating climate change.

Scientific American has said of the IPCC: "Across two decades and thousands of pages of reports, the world's most authoritative voice on climate science has consistently understated the rate and intensity of climate change and the danger those impacts represent."

And there is nothing to indicate, in the political or corporate world, that there will be anything like a major shift in policy aimed at dramatically mitigating runaway anthropogenic climate disruption (ACD).

Guy McPherson is a professor emeritus of natural resources, and ecology and evolutionary biology, with the University of Arizona, who has been studying ACD for nearly 30 years.