ConsistencyFebruary 12, 2010
Democracy Now offers a good example of what I was talking about yesterday. (Hat tip to Max.) Actually, the discussion of climate-vs-weather seems to be everywhere. Here’s another example of it, and Yulsman, as usual, is on the case. The NY Times also adds a nice little bulletin board of bullshit — otherwise known as the “Room for Debate” (never mind that there’s no actual debate) — suggesting that somehow the connection between weather and climate is better understood psychologically. (Seriously? WTF?)
Recall that the issue here is that some have been claiming that the weather on the east coast is “inconsistent with” global warming models. The charge, if accurate, would be damning.
In response to these charges, many have replied that these weather events are perfectly “consistent with” the models.
And there, my little piggies, is the rub.
Here’s an interesting quote from the editors of Democracy Now:
We speak to climate scientist Brenda Ekwurzel of the Union of Concerned Scientists, who argues the extreme weather is in fact a part of global warming.
How are we to understand this? What are we to say?
More after the jump.
Certainly one plausible way to understand it is as asserting that extreme weather events are the kinds of things that are predicted by global warming models. This snowstorm is one such extreme weather event. Therefore, “this storm is consistent with climate change.” Call this S1.
But another plausible way to understand this statement is as reasserting consistency in the face of concerns over inconsistency. Nothing about this storm is inconsistent with CC. There is even room to say that storms like this are a part of global warming. Therefore, “this storm is consistent with climate change.” Call this S2.
S1, we might say, implies that this storm confirms global warming. Confirmation, it is important to understand, this storm cannot provide, so we must reject S1. But in rejecting S1, I think we also reject it as viable interpretation of what is being said.
What is instead being said is S2: that the storm is not sufficient to deny CC on consistency grounds.
Now then, what’s interesting about S2 over S1 is that, even though it may not be the case that S2 is a direct response to any particular claim, it is nevertheless assessable in a context in which consistency arguments are made. Many people appear to believe that some weather events disconfirm CC. Just as being consistent with a model cannot confirm CC, so too can it not disconfirm CC.
It is not true, therefore, that claiming consistency must, in all cases, be qualified with a claim about the disjunction between weather and climate. Weather is, in fact, related to climate, after all. That’s how we establish what a given climate is: by stringing together weather patterns. A single swallow does not a spring make, as Aristotle says. So too with weather and climate.
But here’s where it gets even more interesting. It is not necessarily misleading even if one makes the following very strong claim:
S3: “Weather event W lends further weight and support to the theory of climate change.”
S3 is also not necessarily false, at least if one subscribes to a pragmatic theory of meaning. Why not? For the same reason that S2 is not false. Taken in the broader context, S3 can be used narrowly as an assertion of scientific fact (maybe S3′) or as a response to the implication (and the lingering doubt) that many of us feel in the face of the evidence that climate change is going to seriously affect us (maybe S3”). The point is not psychological — how dumb! — but theoretical. The meaning of the utterance is only ascertainable by appeal to its use. In these cases — shucks, we all have our doubts about the science — lo and behold, our experiences are both consistent with and lend support to the science (which is not immediately perceivable). When we have doubts about the science, what we are doubting is the extent to which the world accords with or is consistent with the scientific view.
In this respect, the fact that a ball drops does not confirm or disconfirm the theory of gravity, but it lends supporting evidence to it. If some object does not drop, it is helpful to have an explanation that confirms consistency. Helium balloons do not repudiate gravity, for instance. It would be silly to suggest that they do. But if someone suggests such a thing, it is perfectly reasonable to reply that they are consistent with the theory of gravity, and that, in some respects, the theory can help predict their behavior.
To finally drive this home, consider instead S4.
S4: “Weather event hammers the final nail in Gore’s coffin.”
This is a very different case. In this case, S4 is employed exclusively to deny or disconfirm the science of CC. That should be clear enough. It is used to charge inconsistency. W is inconsistent with Gore’s theory. (If you need independent confirmation that this is one of the charges, check out the image above. I stumbled on that using google.)
How should one respond to this charge of inconsistency? By explaining either that it is not inconsistent with the theory (saying that it is consistent with the theory); or by taking a stronger position and explaining that it is accounted for (or anticipated by) Gore’s theory, just as we might do with the helium balloon.
Or consider this more charitable interpretation.
S5: “Weather event lends further weight and support to skepticism about climate change.”
S5 can’t lend support to skepticism either, because again, this form of skepticism about climate change is predicated on a consistency charge. One is skeptical about climate change perhaps for a variety of other reasons, but if W is to lend weight and support to that skepticism, it is primarily on consistency grounds.
Think it might have something to do with perspective? Here’s an even more positive version, presumably parallel to S3:
S6: “Weather event lends further weight and support to the theory of global cooling.”
It’s not even clear how to understand this position. Why not? Because there is no non-comparative context in which this might be uttered. Moreover, to my knowledge, nobody of any seriousness is making this claim. If they are, then they are likely doing so primarily in the context of the prevailing view about global warming. Similarly, if they are, then the response to them ought not to be that their conclusions are inconsistent, but rather that there are stronger theories and better explanations than global cooling; and that…su-prise, su-prise, su-prise…climate ain’t weather.
So there’s my response in a not-so-tidy little package: the tables are not handily flipped. If the tables are flipped, then they must be flipped in such a way that attends to the use of the utterance. What matters for the assessment of utterances is not strictly what the statement means (representationally speaking) but what is being said (pragmatically speaking).
I’ll close with this profound thought from Prof. Johnson at Columbia in the NY Times Debate Room:
Both the cancer patient and the snowbound share a tendency to overweigh the immediate concrete evidence in front of them, even when it has little relevance.
No shit. That’s because the stuff in front of us is immediate and concrete. (Incidentally, his title? “When experience trumps data.” Experience is data, yo.)