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Originally Posted by Turtle
The simple fact is, that when a general principle is established, all specific examples obey it. No one is going to publish a 'bad' model, that is, one that has a high variance from observed conditions, so what is published is a 'good' or 'best' model. Having a 'best' implies not only there is a 'worst' , but another 'best' to come. The change from 'bad' to 'good' to 'better' is acieved by tweaking, literally changing, either calculations, parameters, or constants.
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This is how science works though. We will never have a perfect model and we will always be tweaking the ones we have to make them more accurate. As we learn more of the feedback mechanisms, they are incorporated into the model.
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I again point out that one of the main groups of professionals who disagree strongly with the climatologists are the meteorologists, both on the grounds of the modeling errors, as well as the fact that measures of temperature from many stations has risen over time because of urbanization, not global warming. GIGO
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This is a common argument from those that deny a warming trend. Take a look at this:
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When compiling temperature records, NASA GISS go to great pains to remove any possible influence from Urban Heat Island Effect. They compare urban long term trends to nearby rural trends. They then adjust the urban trend so it matches the rural trend. The process is described in detail on the NASA website (Hansen 2001).
They found in most cases, urban warming was small and fell within uncertainty ranges. Surprisingly, 42% of city trends are cooler relative to their country surroundings as weather stations are often sited in cool islands (eg - a park within the city). The point is they're aware of UHI and rigorously adjust for it when analysing temperature records. More on Urban Heat Island...
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Surface temperature records are unreliable
I recommend that site in general actually.
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I am reminded of Ambrose Bearce's comment that a Christian is someone who thinks the Bible is ideally suited to direct the behavior of his neighbor; I submit that the same is true of the Inconvenient Truth. 
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I still have not seen Inconvenient Truth, so I'm not qualified to argue either way. Nonetheless, that seems like a very tenuous extrapolation.
