Energy industries Power resources 61 Energy consumption 40 Energy development 37 Energy policy 30 Petroleum industry and trade 18 Gas industry 14 Environmental aspects 11 Law and legislation 10 Renewable energy sources 10 Technological innovations 9 Industries énergétiques 8 Ressources énergétiques 8 Forecasting 7 Economic aspects 6 History 6 Climatic changes 5 Government policy 5 Investments 5 Consommation 4 Environmental law 4 Finance 4 Énergie 4 Atmospheric carbon dioxide 3 Développement 3 Energy conservation 3 Greenhouse gas mitigation 3 Périodiques 3 Research 3 Subsidies 3