Example image of eyePlorer eyePlorer map for 'EROEI': Energetics Energy economics Physics Ratio Primary energy Fissile Energy quality Net energy gain Energy Slave Thomas Homer-Dixon Roman Empire Deforestation Ecological health Trajan Maya civilization Joseph Tainter Opportunity cost Greenhouse gas Energy cannibalism Fossil fuel Jevons paradox Khazzoom-Brookes postulate Lolland Hydrogen Community OPG 7 commemorative turbine The Coal Question Charles A S Hall Oil depletion Thermoeconomics Shell in situ conversion process Economics and energy Environmental effects of wind power Energy accounting Societal collapse 1980s oil glut Thermal depolymerization Bivalent (engine) Mesopotamia Oil shale economics Economic history of the world Sustainability measurement Learning curve 2000s energy crisis Hubbert peak theory Biofuels by region Predicting the timing of peak oil Oil shale industry Oil shale Ethanol Civilization Vegetable oil economy