"There’s no reason we can’t have energy labels, too. For example, in Europe, Tesco, a supermarket chain, has begun a “carbon labeling” program for some 500 products, which displays the amount of energy consumed and greenhouse gases generated from their production, transportation and use. "...
http://www.nytimes.com/2011/03/09/opinion/09Little.html?nl=todaysheadlines&emc=tha212
http://www.tesco.com/assets/greenerliving/content/documents/pdfs/carbon_label_findings.pdf
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