They state multiple times in the book that the law of unintended consequences is the most powerful principle as it relates to human behavior. Yet, from battling natural disaster to global warming, they seem eager to jump on board to so rather radical steps that would seem to be vulnerable to unintended consequences.
An example of a solution to hurricanes is a device that would funnel warm water deeper into the ocean where cold water would push up. Lower the surface water temperature in crucial areas, and you can prevent hurricane formation. The actual process is rather simple. But even in the book they acknowledge that it could seriously mess up climate cycles including rainfall patterns. I pointed out when talking about the book Forecast, that the problem seems to be lack of creativity in designing buildings that could be largely unaffected by high winds and heavy rains. That would seem to be set us up for less unintended consequences than stopping hurricanes (or as they ultimately suggest, perhaps just downgrading major hurricanes).
The climate change chapter has perhaps gotten the most attention. There are a few irksome elements (misdirection about the panic over global cooling in the 1970s and the fact that things have cooled in the 00s) that ignore the fact that science has gotten a lot better in 30-40 years and that no one is claiming that carbon or anthropogenic causes are the only thing affecting climate patterns (as I presented in a simple graph in a post on the topic a couple months ago). But generally speaking, their skepticism is reasonable, such as “will we be able to act fast enough,” “are we targeting the right thing,” etc.
But I think it is dangerous to casually dismiss carbon tax (or cap and trade) and shoot right on to aggressive geoengineering. A carbon tax, contrary to popular belief, is not likely to be very expensive. And while we may not be able to prevent global warming harm entirely through this mechanism (it may too late, the solution may be incomplete, etc), there are other externalities related to carbon (hence foreign policy experts supporting energy independence) that further offset the cost of the change. And if nothing else, being more mindful in this respect can motivate us to incentivize a great deal of efficiency/conservation programs that literally have no long term cost. We should be converting waste heat in factories into energy. We should be weatherizing houses. These acts have up front costs but have clear long-term gains and it is simply economic waste in the status quo.
What is confusing is they make out these steps as an attempt to make humanity self-sacrificing, making the decision to get less utility from the world in exchange for it not overheating, a charge that, if true, would certainly justify the developing world’s scorn. But there is no particular reason that less carbon means less stuff; it just means less carbon-intensive stuff. Switching to hybrids or fluorescent lights may not be a practical solution to global warming, but they provide an example of what carbon reduction would look like, applied to the true mega-sources of carbon. What you have is a substitute to the original product that provides equal function (moving you around or providing light respectively) but with less demand for energy. And so nuclear, wind, and solar are ways of providing the same electricity that coal produces but with less carbon. The same brains that come up with geoengineering ideas can also come up with new ways to get the same utility from fewer inputs (and less carbon). This makes us better off, not worse. It isn’t a sacrifice, it is simply a restructuring.
Levitt and Dubner may be too cute in avoiding this, but since it is worth having some options if these solutions are insufficient, I’ll play along. Even if having an 18-mile long hose lofted into the sky with giant helium balloons and pumping sulfur dioxide through it with a bunch of tiny pumps is practical (will the balloons need to be replaced/refilled? how would they replace pumps if they stopped working?), the biggest problem raised in the book is who gets to decide what the target is. The negative impact of global warming is not universal and so neither would the positive impact of averting it. Picking a goal for this geoengineering project will naturally be a political statement as there is no reason to think there is a scientifically “right” temperature. I don’t see how this political problem is less than carbon reductions.
On the whole, I have no major objections to the chapter like everyone else had (but then, I’m not a climate scientist). Really the only major problem in the whole book was the short bit on walking drunk in the introduction. I think the fuss over Superfreakonomics was a bit overblown. That said, the book didn’t wow me as much as the first, for whatever reason.