I have been reading a lot of posts that make me long for solid ground. Let me tell the story of sustainability as I experienced it: It all goes back to the Yahoo! groups: Running on Empty 2, Energy Resources, and Energy Round Table, where we heard horror stories which would begin when the world reached Peak Oil. Indeed, the post-Peak Oil world is similar to the world just before the advent of civilization, except that, whereas the prehistoric world got better day by day, the post-Peak Oil world would get worse. But we did not reach Peak Oil. As we all know various factors intervened and year after year we did not reach Peak Oil. This fed into a great deal of skepticism. "Perhaps we would never reach it." But this idea wasn't coming from chemical engineers. We knew that perpetual growth in a finite world was impossible. So far, sustainability was always about having a perpetual energy supply in a world neither the population nor the economy of which was growing. People kept talking about ERoEI as the criterion for sustainability or else finding some reason why it wouldn't work.
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