Changing by degrees :
steps to reduce greenhouse gases.

APA Citation

United States. Congress. Office of Technology Assessment. (1991). Changing by degrees: steps to reduce greenhouse gases. Washington, DC: Congress of the U.S., Office of Technology Assessment .

MLA Citation

United States. Congress. Office of Technology Assessment. Changing by Degrees: Steps to Reduce Greenhouse Gases. Washington, DC: Congress of the U.S., Office of Technology Assessment , 1991.