
Insight 2: We found that it is possible to move to a fully solar-powered society without collapsing and without wrecking the climate system, if we are willing to use the same strategy: that is, investing in solar energy a sufficiently large fraction of the energy produced today.
Axiom 2: Solar energy has been used by humans for a long, long time. Agriculture is the most ancient technology directly using sunlight, while windmills and watermills are indirect methods of exploiting sunlight, used for millennia in the past. What we have been doing recently consists of developing more efficient ways to do exactly what we have been doing in our remote past.
…ies, it also means we will have to re-think and re-do civilization-as-we-know-it. Whatever happens, much of what we have taken for granted in our consumer-centric societies today will be increasingly meaningless in the post-carbon future.