You are commenting on what is known as a 'rhetorical question'. It is a way of saying that showdowns like this OUGHT TO be held over serious problems, rather than non-problems. It is obvious, even from the context provided in the question that what is meant is not that climate change is not or might not be a real problem but that the question of whether climate change is really occurring and whether (by the way) it is in fact human-made and so human-preventable is no such a problem: it is scientifically proven. From the context, the writer is saying, in other words, that instead of arguing over the non-problem of the reality and cause of climate change, we should all be concentrating on climate-change or at least on some "real problem", such as how to slow or arrest it (i.e. over which genuine disagreement and so argument is sensible).
In the same way, the frazzled parent, finally driven beyond endurance by the quarrelling kids in the back of the car might exclaim: "Can't you kids just stop shouting and be quiet for one minute?" The exasperated parent is not asking about their capacity to keep quiet, and, if the children want to drive their irritated parent into a true paroxysm of rage, all they have to do is to say "yes, Dad/Mom, we can" and carry on after exactly one minute!