Climate science is a brand new, multi discipline study. All manner of scientists made an input to the doctrine.
It is the height of arrogance to now exclude all these early contributors on the spurious grounds that they are not "climate scientists". Without the combined knowledge of thousands of scientists who pre-dated this "new" qualification it would be nothing. Please don't limit the "approved" input to "climate scientists". It is a fraudulent limitation.
"Climate Science" hadn't been invented when most of the sceptics were gaining their qualifications and scattered around the world taking empirical measurements and observing the real world.