Media type: E-Article Title: Economic Input−Output Life-Cycle Assessment of Trade Between Canada and the United States Contributor: Norman, Jonathan; Charpentier, Alex D.; MacLean, Heather L. imprint: American Chemical Society (ACS), 2007 Published in: Environmental Science & Technology Language: English DOI: 10.1021/es060082c ISSN: 0013-936X; 1520-5851 Origination: Footnote: