First of all, it’s not useful to dismiss this guy because he’s not a climatologist. As an R&D engineer who works with everyone from technicians to theoretical physicists and mathematicians, I can tell you that the biggest difference between equally talented minds is not in the job they do, but the mindset of the person doing the work. There are plenty of theoretical engineers and practical physicists. Titles don't really have as much meaning as we tend to give them when it comes to the credibility of a source.
Secondly, I would argue that there are many, many hard problems that we must deal with as a society this century. They include (in no particular order):
- Climate Change
- Overpopulation and increased competition for limited and non-renewable resources
- Continuing human-driven mass extinction
- The unchecked rise of authoritarianism
- The world-wide mis-allocation of wealth compounded by the free flow of goods and capital which outmaneuvers traditional regulatory and social checks on vast concentrations of power
- The escalating probability of compound catastrophes due to the weakened social and economic fabric of civilization at a time when we are overdue for several types of natural disaster (volcanoes, earthquakes, asteroid impacts).
- The growing probability of terrorist acts causing large-scale catastrophe due to the continual refinement and broader availability of advanced weapons technologies
I’m sure I’m missing some important ones. These are just generalized root causes that give rise to many particular problems such as the historically-high potential for, and ongoing cost of disease epidemics (e.g. AIDS, malaria), due to population density and the mis-allocation of wealth.
We are living in a small, dense, interconnected world where economic borders are vanishing for the wealthy but growing for the poor and middle classes. We have to confront these problems not as nations but as a whole human society. We’re nowhere near that level of integration, but big social and technological changes can happen quickly, which can drive big economic and political changes.
The cost of dealing with climate change is enormous. It’s greater than several years of worldwide economic output. This points to the fact that to best deal with the problems we confront, we’re going to have to balance costs and benefits. We have to live in the real world and prioritize our goals.
I, personally, doubt that we will survive the next century without incurring massive disastrous losses, perhaps catastrophic losses (Disaster is when a large-scale failure occurs. Catastrophe is when failures result in large-scale losses of life). I won’t go as far as saying that all civilization will end. But I believe that billions of lives will be lost and tens of billions more will be oppressed unnecessarily due to our own lack of coordination and abundance of short-sightedness.
The bottom line is that I don’t think that solving the climate change problem is either practical or desirable as a goal by itself in the context of the many other problems which are of greater consequence. These problems must be dealt-with in concert rather than individually if we have a hope of avoiding catastrophe.
Finally, I will say that the complexity argument is not hollow. I have not seen evidence that climate is a less chaotic system than weather. By their nature, chaotic systems cannot be modeled beyond a short horizon. In climatology 100 years is indeed a short horizon, but these models are also supposed to make a lot of predictions which don’t seem to be verifiable except by waiting. Running the models with varied inputs and seeing a statistical convergence doesn’t prove that they model reality, only that the models produce convergent results. Running them backwards doesn’t really produce meaningful results either. We have constructed useful weather models by testing them against reality repeatedly for decades. There is a huge body of work that has gone into improving them. While some of that work is directly relevant to climate prediction, we just don’t have the luxury of having tested our climate models against as many inputs and scenarios as we have in testing our weather models. Backtesting is only as accurate as our climate data is. Unfortunately, the quality of most of the historical data is highly controversial. I’m not coming down on the side of the skeptics or the “believers”. I’m just pointing out that the skeptics are not simply kooks. They have good points and it is premature the call the whole matter settled.