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In his fascinating, frustrating book “Where Is My Flying Car?” J. Storrs Hall argues that we do not realize how much our diminished energy ambitions have cost us. Across the 18th, 19th and 20th centuries, the energy humanity could harness grew at about 7 percent annually. Humanity’s compounding energetic force, he writes, powered “the optimism and constant improvement of life in the 19th century and the first half of the 20th century.”

But starting around 1970, the curve flattened, particularly in rich countries, which began doing more with less. In 1979, for instance, Americans consumed about 10.8 kilowatts per person. In 2019 we consumed about 9.2 kilowatts a person. To a conservationist, this looks like progress, though not nearly enough, as a glance at CO2 emissions will confirm. To Hall, it was a civilizational catastrophe.

His titular flying car stands in for all that we were promised in the mid-20th century but don’t yet have: flying cars, of course, but also lunar bases, nuclear rockets, atomic batteries, nanotechnology, undersea cities, affordable supersonic air travel and so on. Hall harvests these predictions and many more from midcentury sci-fi writers and prognosticators and sorts them according to their cost in energy. What he finds is that the marvels we did manage — the internet, smartphones, teleconferencing, Wikipedia, flat-screen televisions, streaming video and audio content, mRNA vaccines, rapidly advancing artificial intelligence, to name just a few — largely required relatively little energy and the marvels we missed would require masses of it.

...Hall thinks we’ve become an “ergophobic” society, which he defines as a society gripped by “the almost inexplicable belief that there is something wrong with using energy.”

Here, Hall’s account drips with contempt for anyone who does not dive out of the way of today’s industrialists. He reaches back to old H.G. Wells stories to find the right metaphor for where our civilization went sideways, finding it in the feckless Eloi, a post-human race that collapsed into the comforts of abundance. The true conflict, he says, is not between the haves and the have-nots but between the doers and the do-nots. “The do-nots favor stagnation and are happy turning our civilization into a collective couch potato,” he writes. And in his view, the do-nots are winning.