Great story. Anyone who believes in GW is credible, anyone who doesn't is not; got it.
No, in science no opinion is credible except that which comes out of the accumulated literature in the professional community. It was the one innovation that allowed science to become so successful. It's particular unwillingness to appeal to anyone's opinion as an authority.
As for opinions from "Internet scientists", there are a number of things that signal immediately that someone's opinion is not credible. Appeal to Authority is one of them, which you have done here in order to support your personal claims about global warming. ("You're right, global warming is bogus." -EnoughForMe ) A dead giveaway is the conspicuous citing of the credentials of the authority that is being appealed to.
You see, it doesn't matter what any individual scientist thinks about a particular scientific issue because even Nobel Prize winners can be not only be wrong, but sometimes complete crackpots on certain issues (e. g. Linus Pauling and vitamin C).
What matters is what that scientist publishes in the literature of the professional community and how many times others in the field cite the article in their publications showing independent verification and successful application.
One of the next signals for non-credibility is that the Appeal to Authority is often done by cherry picking certain statements of the alleged authority so as to suggests that the authority supports your opinion. This is related to another non-credibility signal which is the willful rejection of negative evidence.
In this case, you quotes an authority who by his own admission is not a GW sceptic. The term for taking the publication of a scientist, cherry picking pieces out of it to form a different conclusion that is then attributed back to the author is called "pub jacking" (jargon for hijacking a publication).
In this case you have also demonstrated another sign of non-credibility, which is to play on the lay reader's cognitive frame regarding science that equates science to something more like "received knowledge" rather than a work in progress. Science, being the ultimate sceptical intellectual pursuit is constantly challenging and re-testing all of its findings and theories as new information is found and published.
A typical non-credible "Internet scientist" likes to point out areas that are undergoing considerale investigation and debate as some kind of weakness rather than the very process that allows science to be so successful. (Ironically, Internet scientists also like to make that the reason why their crackpot notions are not accepted by science is that it is too dogmatic.)
In actual fact, scienctists challenge each other's findings and refine their theories almost daily as new findings come to fruition. It is a complete work in progress and is ultimately the most sceptical intellectual process we know of.
In this particular case, you have taken the fact that Latif has a particular concern about GW modeling in the area he is working on and claiming that this is a weakness in the overall GW science rather than a strength. You are able to do this because of another non-credible device that works pretty well with the public. This is called "conflation". Since the public is mostly unaware of the subtleties of the issues in modern science, it is easy to convince them of almost anything.
In this case the conflation has to do with short term (yearly), near term (decades), and long term (centuries) climactic changes. You hear "Internet scientists" say this all the time as something like, "Hey, it was really cold during this month of July, so I guess those high falutin' global warming scientists must be full of shit."
As you quoted from the end of the article, there is no surprise amongst climatologists that the models that they are using for long term climate change are not very good at predicting near term climate change. This is no surprise because there are different effects that dominate the measurements over these different time periods.
The problem with using long term models to predict near term changes is that there are periodic effects in the near term that dominate the phenomenon. One of the strong effects is the periodic ocean temperature oscillations called NAO that happen over decades and are pretty strong. So drawing conclusions based on measurements over a decade will give you either an exaggerated idea or an overly conservative idea of what long term change might be happening depending on what part of the cycle you are on.
And since these phenomenon are periodic (coming and going in a cycle over decades) long term models will not consider them as much as near term models would. It is like ignoring daily tidal effects if you are measuring the change in sea level over a long period of time. Therefore, long term models used to predict climate change over centuries will perform very poorly if you compare it to actual measurements you make over short periods of time. (This is why you don't ask the climatologist what the weather is going to be like tomorrow.) In the world of climatology, they have a saying, "Climate is what you expect. Weather is what you get."
What Latif and others are pointing out is that our research and our long term models are better at predicting the long term climate change than they are the near term climate change. This is not suprising because in the long term, cyclical effects will average out. But in the near term, cyclical effects need to be understood and correctly modeled.
As Vicky Pope says in the NewScientist.com article I linked to:
But some of the climate scientists gathered in Geneva to discuss how this might be done admitted that, on such timescales, natural variability is at least as important as the
long-term climate changes from global warming. "In many ways we know more about what will happen in the 2050s than next year," said
Vicky Pope from the UK Met Office. -
New Scientist
My interpretation of these articles is that the scientists who are quoted are not GW sceptics. They continue to accept the fact that the professional community has demonstrated that global warming over the few centuries is likely happen and it is likely to be significant. However, they are warning scientists and laymen alike to not look to near term phenomenon and draw quantitative conclusions about the long term. They are also reminding everyone that the near term phenomenon is more complex and less understood than the long term phenomenon.
There is only one reason why someone would pubjack an article, appeal to the author's authority, mispreresent scientific progress as some kind of uncertainty, and wilfully conflate complex issues so as to lead the lay reader to a different conclusion than the original article author. The answer is that the person doing this seeks to effect public policy on a scientific issue not by challenging the science but by using public venues to appeal directly to the public thereby taking advantage of the public's naivete.