David Friedman on Judging Outside Your Expertise

David Friedman writes:

Accepting the views of experts on a question you are not competent to answer for yourself, assuming that you can figure out who they are and what they believe, is often a sensible policy, but one can sometimes do better. Sometimes one can look at arguments and evaluate them not on the basis of the science but of internal evidence, what they themselves say.

He goes on to give examples of inconsistent claims made by global warming alarmists. His (short) post is worth the read. Here are my 2 cents:

First, (in response to the block quote) deferring to experts is sensible but requires a certain degree of expertise in picking out who they are which is a difficult task. We’re all human, and it’s hard to hold something in your head without thinking it’s true. That makes it hard to not be arrogant. We need to emphasize strongly that interpreting information is hard, and the outcomes are not at all obvious. Those concerned with anthropogenic climate change (myself included) are better served by stressing the uncertainty involved and making arguments centered on appropriate risk management.*

Second, The issue of climate change boils down to a series of sub-issues that need to be considered carefully:

We need to think about costs and benefits. A warmer world would be a boon for many people. If we could set the average world temperature, we would want it to be higher than 0 Kelvin. We might even want it to be warmer than it is today.

We need to think about the uncertainty surrounding what’s happening, as well as what we can do about it. We should be particularly skeptical about cost estimates for any effort to try to control the environment.

(This one’s a bit of a non sequitur.) We should use this as an excuse to do things that would help reduce the costs of climate change that we should be doing anyways. Specifically, we need to liberalize immigration policy in wealthy nations. Let’s say there’s a 0.00001% chance that climate change has a bad outcome, and that specifically that outcome is that the entire country of Bangladesh will catch fire and kill everyone. That’s a good excuse to let Bangladeshi’s come to America, but we should be doing that anyways. It’s a low cost (actually a negative net-cost) solution to a potential problem of climate change.

Here’s one that I think the smarter alarmists/deniers already recognize: this is a political discussion. Politics and the truth don’t mix. But recognizing this point and making it widely known may allow people to tone down and argue something closer to the truth.

Global warming will lead to catastrophic… life?

Both sides like to think of themselves as skeptical (as demonstrated by that masthead which warns that we might have to suffer through the addition of a habitable continent (?)), and good for them. We should value skepticism in this. But that skepticism shouldn’t lead us to make bold claims on one side or the other. It should lead us to ask a lot of “what if?” questions. This is a risk management issue, not a social engineering one.

* I like Taleb but I’m not as worried by GMO’s as he apparently is, but I haven’t read that paper either.


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