Environmental aspects Petroleum industry and trade 16 Oil spills 8 Energy policy 7 History 7 Petroleum 7 Political aspects 7 more ... Politics and government 6 Oil well drilling 5 Exxon Valdez Oil Spill, Alaska, 1989 4 Prospecting 4 Cleanup 3 Corporate state 3 Endangered ecosystems 3 Environmental conditions 3 Environmental impact statements 3 Foreign relations 3 Frontier and pioneer life 3 Gold discoveries 3 Gold miners 3 Gold mines and mining 3 Military aspects 3 Nuclear weapons 3 Offshore oil industry 3 Oil pollution of soils 3 Oil pollution of the sea 3 Petroleum engineering 3 Shore protection 3 Testing 3 Wildlife conservation 3 less ...