No economy is a closed, autonomous universe, governed by rules independent from law, morals, and politics. Indeed, the most interesting economic questions are generally located on the borderline with neighboring disciplines. But nowhere is this clearer than in the interaction between economic processes and the natural environment.
The distinctive feature of this exchange is that it is governed not by the laws of mechanics, but by thermodynamics, particularly the law of entropy, according to which the quantity of free energy that can be transformed into mechanical work diminishes with time – an irreversible process culminating in “heat death.” Numerous researchers, inspired by the late Nicholas Georgescu-Roegen’s pioneering work on the relationship between economic processes and physics, tried – not very successfully – to formulate an “entropic” theory of economy and society, especially during the 1970’s.
The entropic view assumes that economic processes produce irreversible consequences because of their multiple interactions with nature. We draw from stocks of non-renewable natural resources (for example, oil and metal ores), and we deteriorate or modify the quality of other resources (for example, water and arable land) by imposing on them a rhythm of exploitation superior to their capacity for regeneration. In fact, the exploitation of non-renewable resources frees the speed of economic growth from that of ecological renewal, aggravating the deterioration of the biosphere, including irreversible climate changes.
The law of entropy reminds us that we will leave to future generations a degraded natural patrimony, probably less adequate to their needs than what we inherited. Unfortunately, there are no simple answers. For the sake of what principle can we ask China and India, for example, to limit their economic dynamism so that they use smaller amounts of the planet’s natural resources? After all, the advanced countries’ slower growth is not the consequence of voluntary self-limitation, but of our superior standard of living – and of our incapacity to settle our own economic imbalances.