Some folks who argue against anthropogenic climate change argue that folks like me who accept the evidence that it's happening and it's something we should worry about are guilty of bad science. Specifically, that we're accepting arguments from authority, rather than evaluating the evidence.
While argument from authority works in some lines of reasoning, it's anathema to science. Science usually proceeds by starting from a set of assumptions or postulates, and seeing what results-- but those assumptions and postulates are always subject to test, and if experiment or observations show that they're wrong, they have to be tossed out. We believe something is true in science because the experiments or observations have show it to be true, not because some designated authority has asserted that this is how things are.
However, if you perform reducto ad absurdum on this argument, most of us have no right to accept the vast majority of the scientific knowledge that the human race has amassed. Have you, personally, verified Einstein's theory of Special Relativity? OK, I have seen the moons of Jupiter making their way around Jupiter, so I've confirmed Galileo's observation disproving Geocentricity... but have you? And if you haven't... what right do you have to assert to Geocentrists that they're full of it, and that the center of mass of the Solar System is really close to the Sun? Huh? Huh?
We accept and rely upon the judgment and opinions of experts in many areas of our lives. We seek out lawyers with specific expertise relevant to the situation; we trust the pronouncement of well-trained airplane mechanics that the plane is fit to fly. Indeed, the more technical the subject area, the more we rely on experts. Very few of us have the technical ability or time to read all of the primary literature on each cancer treatment’s biology, outcome probabilities, side-effects, interactions with other treatments, and thus we follow the advice of oncologists. We trust the aggregate knowledge of experts – what do 97% of oncologists think about this cancer treatment – more than that of any single expert. And we recognize the importance of relevant expertise – the opinion of vocal cardiologists matters much less in picking a cancer treatment than does that of oncologists.
They don't even reducto to as absurdum a point as I did-- whereas I was talking about replicating the experiments yourself, they're just talking about reading the primary literature. Of course, in reading the primary literature, you're already taking some things on faith. (Little-f faith, not big-f Faith.) Specifically, you're trusting the ethics and competence of the investigators who performed and confirmed the experiments. You're trusting that it's not one big collusion and conspiracy amongst the writers of the primary literature to promulgate a falsehood on the rest of the world.
We do that constantly, every day, and it's only rational to do that. This includes climate change. The vast majority of people who know anything about climate change are convinced about the existence of anthropogenic climate change, and that it's a problem. The details and the severity of the problem remain under debate of course, but the consensus that there's something to worry about is very strong. Accepting and acting on their expertise is not resorting to an argument from authority; it's just trusting the experts to know their field of expertise. Saying that we shouldn't advocate national and global response to the problem of global warming without each of us individually verifying the evidence ourselves is tantamount to saying that it is unwise to get on an airplane without learning enough to verify the mechanical fitness of the plane first.