Well no, of course they haven’t. It is yet more septic twaddle from Avery; David Appell has a screenshot, since he expects the original is so blatantly stupid that it will be taken down. And he was right, it is now gone, though not silently: *Apologia: I deeply regret my misstatement that CO2 levels are Mauna Loa were declining. They are not. Nor is there clear evidence that the increase in atmospheric CO2 is yet slowing. In the past, I have demanded a higher standard of evidence than I had for the first edition of this column, and will return to that policy. says The American Daily, and the piece now has a new title. But it is a mistake that can only be made by wishful thinking; everyone else knows that CO2 is up year on year, and doesn’t even need to look at the figures.
But if you *are* going to look at the figures, it is a good idea to do it properly. Try a little test: what is wrong with Joe Romm’s takedown of Avery?
Yes, that’s right: in attempting to refute the idea that CO2 has declined since 2004, Romm shows a graph that doesn’t include any 2004 data. Doh! as he might say. Oh look, he did say it :-). The Wonk Room has a usable version of the same graph.
BTW, to include a tiny bit of actual science, it is worth noting that the growth rates that Romm quotes (quite likely correctly) are ~2 ppm/y recently, which is a about 0.65%, since CO2 is at ~380 ppm. And that is rather less than the 1% that gets you to CO2 doubling in 70 years. So we’ll have to work hard to stay on IS92a. Back in the days when I had access to decent graphical software I could do stuff like this. Ah well.