CONCEPT
Emergy
Odum's measure of the total embodied solar energy required across all transformations to produce a given product or service — the memory of energy the system carries.
Emergy, carrying the 'm' of memory, is Howard T. Odum's quantitative accounting of the total solar equivalent energy that had to flow, transform, and be consumed across time to produce any given output. Unlike energy measured in joules at the moment of use, emergy traces the full history of transformations — the sunlight that grew the plants that fed the animals that fertilized the soil that grew the grain, or the geological processes that concentrated ancient biomass into oil. Applied to AI, emergy analysis reveals that a prompt processed by a language model is not the near-costless transaction the interface presents but the endpoint of chains extending through mineral extraction, semiconductor fabrication, grid infrastructure, and centuries of institutional emergy embedded in training data.
In The You On AI Field Guide
Odum developed emergy analysis across five decades to solve a problem conventional economics and energy accounting could not address: the invisibility of accumulated cost. A barrel of oil sold for ninety dollars does not reveal the millions of years