Farah, Paolo Davide; Rossi, Piercarlo (December 2, 2011). „National Energy Policies and Energy Security in the Context of Climate Change and Global Environmental Risks: A Theoretical Framework for Reconciling Domestic and International Law Through a Multiscalar and Multilevel Approach“. European Energy and Environmental Law Review. 2 (6): 232–244. SSRN1970698.
Michael Ruppert. Collapse. Event occurs at 27:50. https://www.youtube.com/watch?v=bHvd7WHQZ78. "There are ten calories of hydrocarbon energy in every calorie of food consumed in the industrialized world."