Columbia subject headings:
Harvard subject headings:
Agriculture--Environmental aspects--United States
Emissions trading--United States.
Global warming--Economic aspects--United States.
Greenhouse gases--Economic aspects--United States.
Small business--Energy consumption--United States.
Small business--Environmental aspects--United States.
United Nations Framework Convention on Climate Change Protocols, etc.,
Princeton subject headings:
Agriculture--Environmental aspects--United States.
Emissions trading--United States.
Global warming--Economic aspects--United States.
Greenhouse gases--Economic aspects--United States.
Small business--Energy consumption--United States.
Small business--Environmental aspects--United States.
United Nations Framework Convention on Climate Change Protocols, etc.