A method and apparatus for determining standardized environmental attributes is disclosed, including a method and apparatus for generating and quantifying standardized carbon emission reduction credits. General data and site-specific data, if available, are input into a suitable model to determine the approximate change in the environmental attribute as a result of a human-caused change. An uncertainty analysis is conducted on the results to quantify and normalize the environmental attribute. Standardized environmental attributes may be compiled for trade and other standardized environmental attributes are placed in reserve.