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Hi Doug,
because you wrote "Also if one wanted a weightier question one could ask how one supplies clean drinking water to society" I found this article about drinking water it offers many kinds of contamination for consideration but does not mention, at all, that these sources of contamination can be avoided by collecting and drinking rainwater from roofs.Contaminants in drinking water In places that have a rainy season the water tank should ideally be large enough to contain all of the rain that falls on it, for use later in the year. The global groundwater depletion problem is also relevant Groundwater depletion a global problem,(click look inside)Instead of community bore holes or reservoirs open to contamination individual families could construct or buy their own covered rain water tank for private use. It could be under the house or nearby.
You wrote "The point of this mundane example of how to supply hot water to a society illustrates that when deciding on how to weight a particular societal path one needs to choose a set of criteria e.g. efficiency, convenience, safety, ease of implementation, etc. by which to judge any given path. This part of the societal path integral proposal is the most subjective and may lead to different groups choosing different paths as best or 'classical'"I think rainwater collection wins in efficiency, safety and ease of implementation in rural and suburban environments. The only problem being when it runs out.I don't have to pay any water rates, the rain is completely free. I think there may be the perception that the water is dirty because it has come off of the roof when it is less contaminated. I only have a rainwater tank, under the house. The water is filtered once for general use and a second time through a micro-filter for drinking.
Quote "The main thrust of this essay has been, that in so far as it is possible for humanity to steer a course, it can try to steer a best or 'classical' course by at first trying out, on a small scale, as many different paths as possible."You have also mentioned that some projects would not scale up. It is also the case that some projects only work if they are full scale. I don't know how it would be possible to try out on a small scale obtaining water from reservoirs, (such as this- Birmingham England is supplied from Wales,via an enormous endevour constructed during the industrial revolution Elan Valley water, Amazing!)( works brilliantly but is huge), for comparison with obtaining water from bore holes tapping ground water or rainwater collection or even desalination. It might be necessary to construct models to analyse the pros and cons and to compare and contrast, rather than being able to carry out a small scale trails of all of the possible projects.
A thought provoking question, Thank you, Georgina