• AGRICULTURE    332.97
• AIR POLLUTION    342.08
• BIOFUEL    341.22
• BIOMASS    341.32
• BIOTECHNOLOGY    152.73
• CHEMICAL ENERGY    341.92
• COAL    341.24
• COAL SECTOR    421.21
• ECOLOGICAL TRANSITION    342.61
• ECOLOGY    342.75
• ECONOMIC POLICY    332.65
• ECONOMY OF SCARCITY    333.48
• ELECTRIC MOTOR    152.26
• ELECTRIC POWER STATION    341.95
• ELECTRICAL ENGINEERING    152.36
• ELECTRICITY    341.65
• ELECTRICITY AND ELECTRONIC SECTOR    423.55
• ENERGY    341.55
• ENERGY CONSUMPTION    341.68
• ENERGY CRISIS    341.58
• ENERGY POLICY    341.57
• ENERGY PRODUCTION AND DISTRIBUTION SECTOR    421.52
• ENERGY SAVING    341.79
• ENERGY SOURCE    341.63
• ENERGY TRANSFORMATION    341.87
• ENERGY TRANSITION    341.52
• ENERGY TRANSPORT    341.88
• ENERGY USE    341.37
• ENGINE AND TURBINE    152.24
• ENVIRONMENTAL PROTECTION    342.55
• FOSSIL ENERGY    341.53
• FUEL    341.33
• GAS    341.13
• GEOTHERMAL ENERGY    341.70
• HYDROCARBON    341.23
• INDUSTRIAL GAS    341.02
• INTERNATIONAL RELATIONS    311.72
• LASER    341.91
• LOGISTICS    141.43
• NATURAL GAS    341.03
• NUCLEAR ENERGY    341.84
• OIL    341.14
• PETRODOLLAR    335.80
• PIPELINE TRANSPORT    143.85
• RAW MATERIAL    142.75
• REFINING    341.18
• RENEWABLE ENERGY    341.62
• SHIP    143.25
• SOLAR ENERGY    341.81
• TRANSPORTATION    143.55
• WATER    342.68
• WATER POWER    341.41
• WIND POWER    341.50
• 14    PETRODOLLAR    335.80
• 23    PIPELINE TRANSPORT    143.85
• 24    COAL SECTOR    421.21
• 32    BIOTECHNOLOGY    152.73
• 32    AGRICULTURE    332.97
• 33    AIR POLLUTION    342.08
• 41    WATER    342.68
• 52    ECOLOGICAL TRANSITION    342.61
• 52    ECOLOGY    342.75
• 55    LOGISTICS    141.43
• 55    ENERGY PRODUCTION AND DISTRIBUTION SECTOR    421.52
• 55    ENVIRONMENTAL PROTECTION    342.55
• 55    RAW MATERIAL    142.75
• 57    ECONOMIC POLICY    332.65
• 58    ECONOMY OF SCARCITY    333.48
• 58    INTERNATIONAL RELATIONS    311.72
• 65    ELECTRICITY AND ELECTRONIC SECTOR    423.55
• 65    ELECTRICAL ENGINEERING    152.36
• 87    ENGINE AND TURBINE    152.24
• 87    ELECTRIC MOTOR    152.26
• 88    SHIP    143.25
• 88    TRANSPORTATION    143.55
• -   Agrofuel    341.22
• -   Carbon tax    341.57
• -   Electric power    341.65
• -   Energy economy    341.55
• -   Energy market    341.55
• -   Fuel    341.33
• -   Hydro electric power plant    341.95
• -   Light    341.63
• -   Mine    341.37
• -   Nuclear power station    341.95
• -   Offshore    341.37
• -   Oil research    341.14
• -   Onshore    341.37
• -   Thermal power station    341.95
• -   Uranium    341.84
• -   Wind    341.63