It such a ridiculous claim that it's difficult to understand what to say to refute it.
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It takes a global grand conspiracy, infiltrating every academic and research institution on the planet, and leveraging only the climate change departments, somehow influencing postdocs and students as well.
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Absolutely fucking insane.
While I agree that the idea of a global conspiracy paying for favourable studies is quite far fetched, you should't discount the advantages feeding the current group-think.
If you have favourable results agreeing with the group-think of the day, you get press, people will cite you and you'll have it easier to get funding because you do proper science matching the expectations. That's how it always was and that's also why many new (and in retrospective correct) ideas have been strongly opposed by the establishment. Also, it's important to not, for every correct new ida, the establishment rightly opposed a gazillion of wrong or crack-pot ideas.
The point is, the establishment usually is more interested in keeping up the gravy train and everyone agreeing with it has an easier ride. Only when the current group-think starts to have so many cracks that they can't be ignored any more, new ideas are accepted. A very typical case is the purely newtonian approach to gravity mechanics compared to the relativistic one.
With climate sciences we have the additional problem, that most predictions pretty much agree up to 2040 within their error margin. So whatever happens ( if it isn't too extreme), most of the models can claim to have been mostly right. Only what happens afterwards the models start to diverge more.
As none of the current models has a proven track record of predicting the future better than the others, they're constantly refined and changed to match newly available data.
The best path to success is to produce a new model matching the data and supporting the ideology of those paying my bills. At the moment, hysteric predictions of doom are most popular in politics and media. On the other hand, if you're from an institute financed by big oil companies, it might make your life easier if your predictions are more along the lines of everything is fine, nothing is going to happen.
None of this however says anything about what's really going on.