Have you taken the Freakonomics global warming quiz? It involves a series of True/False questions that are designed to get the reader to agree with the SuperFreakonomics climate chapter. "Uncertain" is not a possible answer even when we get to the technological questions. Such as:
There exists an engineering design that provides a means of delivering
enough sulfur dioxide to the stratosphere on a continuous basis to
effectively cool the Earth. The estimated cost of building and
implementing this technology is a few hundred million dollars.
True/False
I would answer uncertain (as would at least one engineer). We don't know if it will work as intended, we don't know if there will be unintended consequences and we don't know if it will actually be cheap. What strikes me as so odd is the narrow technological thrust of the whole SuperFreak geoengineering message:
A much better approach, we conclude, is geoengineering. The scientific
evidence suggests that either the stratoshield or increased oceanic
clouds would have a large and immediate impact on cooling the Earth,
unlike carbon-emission reductions. The cost of these solutions is
trivial compared to the cost of lowering carbon emissions — literally
thousands of times cheaper! Perhaps best of all, if something goes
wrong and we decide we don’t like the results of the stratoshield or
the oceanic clouds, we can stop the programs immediately and any
effects will quickly disappear. These two geo-engineering solutions are
completely reversible.
Economists love to make fun of government bureaucrats for "picking winners." In other words, picking winners involves deciding which technology will come out on top and backing it with the full force of government. If you are slightly ignorant about how this stuff works it is quite likely that you might pick the wrong winner. This is why economists tend to advocate government expenditure for R&D and then allow the power of market forces decide the winning technology.
Note: I still haven't received my copy of SuperFreak and so still haven't read the climate chapter. These comments are based entirely (or, at least 95%) on my reading of the post link above.
Another note: It is not just "environmentalists" who are criticizing this chapter. "Jason" in the comments section says this which seems right on:
The question isn’t whether geoengineering deserves a seat at the table
- everyone agrees it is worth researching. The question is whether it
is worthwhile to expend resources to reduce carbon emissions
immediately while this research is being conducted. Your critics seem
to say, “Yes, it certainly is.” As far as I gather from this blog post,
you are saying, “No, it isn’t.” To accuse your critics of failing to
“approach the questions like economists” is extremely disingenuous.
There is a substantive economic question here about whether
geoengineering type solutions and reducing carbon emissions are
substitutes or complements. You have failed to engage with your critics
who argue that they are complements.