by Judith Curry
A few things that caught my eye this past week.
CO2 hits 400 ppm – does it matter?
Discover Magazine has announced its top science stories for 2013. One global warming story made the top 10 – #3 CO2 hits 400 ppm – Does it matter? In May, the amount of CO2 in our atmosphere crossed this long-hyped threshold, setting off a storm of media coverage. But how significant is the milestone?
‘Does it matter?’ is the trillion dollar question, I agree this should be the top AGW story for 2013.
Nic Lewis at ClimateAudit
Nic Lewis has a post Does the observational evidence in AR5 support its CMIP5 models’ TCR ranges? In the comments, McKitrick summarizes it:
One of the really remarkable points Nic makes here is that, just using numbers from the IPCC report itself, and applying their own formula for transient climate response, an estimate of around 1.3C is unavoidable. Yet most of the models they employ have TCR’s of 1.6 or higher, and quite a few are even above 2, implying way too much sensitivity to CO2 emissions. Yet the IPCC goes on to say things like “There is very high confidence that models reproduce the general features of the global-scale annual mean surface temperature increase over the historical period, including the more rapid warming in the second half of the 20th century, and the cooling immediately following large volcanic eruptions.” (Ch 9 p. 3). The whole summary section of Ch 9 gives the impression that models and observations are beautifully in alignment. Something’s gotta give here.
Boycotting Nature and Science
Randy Shekman, Nobel laureate, says his lab will no longer send papers to Nature and Science, because they distort the scientific process [link]
The National Journal poses the question How Best Can We Use Natural Gas? Should We At All? There isn’t much to the main post, but the comments are really interesting.
This past week, I have been attending the annual meeting of the American Geophysical Union in San Francisco. While I enjoyed my week, I find trying to navigate the huge number of talks and sessions to be a mind numbing experience. A number of people have been tweeting. The best overview can be found at David Appel’s site, where he links to a number of posts at Yale Climate Media Forum.