UPDATE 2: Thanks to this post, the deniers finally conceded that “the rate of atmospheric CO2 growth has been increasing” — but in a callous, error-riddled post, WattsUpWithThat cheers on the preventable calamity.
UPDATE 1: I had a good conversation with the co-author Didier Sornette. This was a draft analysis: They made a numerical mistake in one of the footnotes and used some inapt wording in a couple of places, none of which changes the main conclusion about CO2 concentrations. They will be revising the paper and I will make some changes below.
Recent climate science is unequivocal that human civilization is on the precipice. Climate science also finds that we are pouring carbon dioxide pollution into the atmosphere at an unsustainable rate. A 2008 Nature Geoscience study found that humans were boosting CO2 levels 14,000 times faster than nature, overwhelming slow negative feedbacks.
That study found, “the mean long-term trend of atmospheric CO2 levels is no more than 22 p.p.m.v. over the past 610,000 years.” Humans have run up CO2 levels 100 ppm over the last two centuries! The author of that study noted, “Right now we have put the system entirely out of equilibrium”
It turns out that a purely mathematical analysis, “Evidence for super-exponentially accelerating atmospheric carbon dioxide growth,” comes to a similar conclusion.