Columbia subject headings:
Industries--Environmental aspects--United States.
Labor supply--United States.
Nature--Effect of human beings on--United States.
Harvard subject headings:
Industries--Environmental aspects--United States
Labor policy--United States
Nature--Effect of human beings on--United States
Sustainable development--United States
Princeton subject headings:
Industries--Environmental aspects--United States.
Nature--Effect of human beings on--United States.
Unemployment--United States.