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The alarmists who warn about recent man-made global warming are the ones who deny the reality of climate change. They are, in fact, advocates of climate stasis. They assume that the "normal" climate is basically what it was in 1970—not coincidentally, about the time of the first "Earth Day"—and any recent variation from that norm must require some extraordinary explanation.

The money quote.

I thought this quote summed up part of the problem very concisely:

Note, in this context, the way in which the man-made global warming alarmists declare that only certified "climatologists" have any authority to speak on the subject, dismissing the legions of skeptics from fields like geology or physics. On a practical level, you can see how this helps preserve the monopoly of the establishment. A relatively small group of academics at a fixed number of universities and research institutes, all supported by the same government agencies with the same agendas, get to decide who joins the closed club of "climatology." Whereas if you have to bring in the geologists and the physicists and the astronomers, they have all come up through independent institutions with sources of funding that tend to be more varied and less political.