Unless you try questioning Climate Science, of course. That science is totally settled and unless you have four papers published in a climate-specialist journal you are not qualified to question it.

Climate Science isn't alone in this, though. Archeology also requires a PHD before you can comment on the purpose of any artifacts dug up by archeologists, even though archeology degrees don't teach anything about (for instance) textile production.

And then there's the various interesting parts of Social Sciences, which often require you to have a particular identity or experience before you can question any part of their conclusions.

I agree that Science should be a "use your own brain" kind of endeavour, but increasingly it is not, unless you have the appropriate letters after your name.