Final-Fan said:
Well, to be honest, some of it was probably just based on not thinking about the scale involved. As you say, when it's a massive 900-page whatever, it's going to be pretty thorough, and there's time to cover a lot of ground (even if the first part would, if correct, make it not strictly necessary), etc. etc. A short article that flew from subject to subject, staying just long enough to throw some counterpoint or other like throwing a can of paint at a fence, would be quite a different thing. |
I don't really get the preoccupation with the who wrote it - rubbish is rubbish - science is science. I gauruntee you there is a little of both in the paper as it is nearly 900 pages and I doubt any human(or group thereof) is that perfectly unbiased as to be perfect - which of course is also true of AR4. I'm still working my way through this report - slower than I'd like thanks to a busy schedule and trying to keep up with regular reading outside of this larger reading project. But the idea is you should read it, compare to what you know, revise your views as you see fit, and search out new information to add to your knowledge or to use in assessing the paper.
As for the benefits - we would first have to know what kind of warming we are assuming and then what levels of C02 we are assuming to be associated with that warming before we can talk about the benefits and detriments.
The problem I have is that to in order to get to the kind of catastrophic warming scenarios where detrimental warming is valid we have to believe that the climate is dominated by positive feedbacks. To understand what this means I can give the example of a nuclear explosion as the epitome of a process dominated by massive positive feedback, It gets more and more unstable until it is out of control - with a nuke this takes far less than a second. As opposed to something that is dominated by negative feedbacks like throwing a baseball, no matter how hard you throw it (unless you're superman) this process is dominated by the negative feedback of gravity bringing the ball back down and your throwing motion is completely overshadowed by this negative feedback in no time at all.
Our climate is constantly struggling for equilibrium which implies negative dominance..this is a basic premise of meteorology and weather prediction. The dance of high and low pressure, warm and cold air, east and west currents, high and low tide, etc.. - but the climate has not increased in instability as was claimed (this is why we were told we would have more hurricanes, tornados, floods, etc...) but has remained in line with what we've always seen going about its natural cycles like those of the PDO and ENSO as usual. This is inherantly the behavior of a system dominated by negative feedbacks.
This feedback value (the assumed positive feedback value that is) is what they are using to multiply the climate sensitivity agreed to be between 0.8-1.2C up to 3C to 6C - climate sensitivity being the amount of warming expected from a doubling of atmospheric C02 (the basic range being agreed on because it is so easy to just test it in a lab). Without that multiplier from the assumed dominant positive feedback you simply don't get catastrophic warming at all, you get gradual climate change like we've always had striving for an equilibrium it fails to reach due to constant input from lunar gravity and solar irradiance.
In addition to that is the data these models are using which is, to put it mildly, atrocious. Stations are, as a matter of policy, used to "correct" data of other stations at distances up to 1,000km (~621 miles) away from them. The top 100 such "influential" stations are used to "influence" more than 100 other stations, with the top ten all influencing at least 235. Three of the top 4 of these "influential" stations are located at airports, and most on the list have MOEs of >2C.
This is actually what Mr. Watt's current project (the one that has him being branded a "kook") is all about. He has the audacity to systamtically visit (as well as several volunteers) and photographically document all of the 1221 climate stations in the USHCN, while also updating the network database to include greater GPS accuracy of their locations (most of the current locations are very bad estimates and hard to find - thus he makes it easier for others to go visit these stations later). Furthermore he makes all of this data and photographic evidence available online. He then has the gall to use the objective siting criteria used by NOAA to evaluate these stations and assign ratings which can be verified by anyone who wants to go to the site and see why a station was given its rating. What they have found, and what anyone can go see for themselves, is that more than 90% of the stations in the network that have been surveyed so far (and they have surveyed over 1000 now) have a MOE greater than the anthropogenic warming that has been alleged to have already occurred.

The IPCC claims that 60% of the warming in the last century is anthropogenic. Based on the above graph that would be ~0.36C or ~8.39 times smaller than the aproximate average station MOE of ~3.02 (aproximate because a given rating is a range not a fixed number, in all cases the difference was split with the exception of the final category which was offset by the same amount as the previous category).
edit: Adding this since it is an important footnote, the majority of the station siting problems are human-added bias caused by development that has built up around stations in the past 30+ years. This could be a coincidense but it is an important fact to have in relating this to the record.
Here is the most recent graph I could find :

Or if you prefer it geographically:

And if all of that wasn't bad enough here is what happens when you take the final data set produced by NOAA from USHCN and subtract it from the raw data:

Note that I focus on the models because outside of models and their data there is nothing that suggests catastrophic warming is in our future.








