Environmental aspects -- Congresses 2 Security, International -- 2 Chlorofluorocarbons -- 1 Climatic changes -- 1 Economic aspects -- 1 Economic conditions -- 1 more ... Energy policy -- 1 Global environmental change -- 1 Government policy -- 1 Ozone layer deplation -- 1 Petroleum industry and trade -- 1 Political aspects -- 1 Power resources -- 1 less ...