TY - JOUR TI - Comments on “The Energetic Metabolism of the European Union and the United States” by Haberl and Colleagues: Theoretical and Practical Considerations on the Meaning and Usefulness of Traditional Energy Analysis PY - 2006 AU - Mario Giampietro T2 - Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources LK - https://onlinelibrary.wiley.com/doi/abs/10.1162/jiec.2006.10.4.173 DO - 10.1162/jiec.2006.10.4.173 ER -