In 1971, Roegen, in his The Entropy Law and the Economic Process, outlines a very confused theory of “material entropy”, based on a mis-interpretation of “bound energy” (TS) and “free energy” (H or G), in relation to fossil fuels, like coal and gas, which he equates to "bound energy", which is incorrect; in other words a lump of coal is the product of entropy and temperature. His entire book, basically, is based on a terminological confusion.
- Georgescu-Roegen, Nicholas. (1971). The Entropy Law: and the Economic Process. Harvard University Press.
- Nicholas Roegen – Hmolpedia 2020.