Goran Wall's "Exergy, Ecology and Democracy - Concepts of a vital society or
a proposal for an exergy tax" has come a long way since its presentation in
1992. Wall has extended the thermodynamics to the sustainability analysis of
economic, environmental and societal models. The authors of this paper aim
to discuss Wall's intuitions in today's scenario. Governments are assuming
increasing measures against climate change and toward sustainability.
However, these measures do not affect the concentration of greenhouse gases
and global heating. It is an evident failure from a thermodynamic point of
view. The economic indicators used by governments to measure the progress
toward U.N. Sustainability Development Goals and the Paris Agreement reveal
a scarce consistency. One of the most used is "domestic material
consumption" (DMC). It accounts for the mass balance of the materials
entering or exiting a national economic system. However, it lacks
consistency and delivers insufficient information because it neglects the
impacts of import-export. As Wall shows, more effective and consistent
indicators are necessary to account for sustainability. The most relevant is
exergy, which has been presented and discussed widely.