"resource economics" . "natural resources" . . "lack of natural resources" . "resource economist" . "Environmental and natural resource economist" . "Natural resource economics" . "Resources" . "Natural Resource Sciences" . "Natural resource economics" . "Natural Resource Economics" . "Renewable Resources and Conservation" . . "its lack of natural resources" . . "Resource" . "natural resource" . . . "resource" . "Resources and the environment" . "natural resources economics" . "Resource Economics" . . . "resource scarcity" . "Resource economics" . "economy continues to be based on natural resources" . "natural resource economics" .