A Common Scale for Our Common Future: Exergy, a Thermodynamic Metric for Energy

A major challenge in striving for energy efficiency is the selection of technological systems, particularly given the need to consider multiple environmental, economic and social concerns. In addition, the general public, policy makers and experts alike misunderstand the physical nature of energy and hence its efficient use. After decades of fragmented agreements, regulations, treaties, strategies, indicators, targets, directives and communications, the European Union (EU) in its Energy Union strategy needs to take the lead in restoring the energy debate to firm foundations: those of thermodynamics, the science of energy.