Without energy, there is no economy or as @ProfSteveKeen puts it:
"Labor without energy is a corpse, capital without energy is a sculpture." 1/20
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(C.f. some more quotes from
ncbi.nlm.nih.gov/pubmed/20146764
and how the crash in '08 was likely largely due to the oil price spike).
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The most important one being "EROI final", defining the energy invested part in the broadest sense possible - also including all losses.
nature.com/articles/s4156…
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en.wikipedia.org/wiki/Heat_pump…
link.springer.com/article/10.247…
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llnl.gov/news/us-energy…
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(EROI = "EROI primary energy" in the figure in 7/)
(Similar tendencies for wind. EROI of hydro is very high, but we are running out of rivers to dam.)
C.f.:
energywatchgroup.org/wp-content/upl…
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thermalhydrogen.com
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