Economics of land and energy Conservation and protection 2 Natural resources 2 Natural resources and energy 2 Cost benefit analysis 1 Dissertations, Academic(Ph.D.) 1 Energy 1 Environment impact 1 Environmental economics 1 Land 1 Macroeconomics 1 Mass media and the environment 1 Microeconomics 1 Recreational and wilderness areas 1 Thesis (Ph.D.)- History 1