From OCLC’s website:
“DUBLIN, Ohio, USA, 17 May 2010—This report details the findings from an OCLC Research-sponsored study of the environmental impact of current interlibrary loan practices, as well as recommended practices for reducing the carbon footprint of resource sharing operations worldwide.
OCLC Research commissioned a study of current interlibrary loan (ILL) practices by California Environmental Associates, a firm of environmental impact consultants. Utilizing data provided by OCLC and gathered during interviews with staff at a dozen US libraries, the consultants correlated specific interlending practices with measurable impacts on greenhouse gas emission levels. These findings, along with key recommendations and best practices, are included in the report.”