How to calculate the carbon footprint -- the amount of carbon released -- in the production of something like beer? It depends. Photo of beer in Portland, Oregon from Creative Commons by afagan/flickr
http://www.washingtonpost.com/national/environment/whats-in-a-carbon-footprint-depends/2011/04/20/AF2qwyKE_story.html?hpid=z3Washington Post, April 22: "What’s in a carbon footprint? Depends.": Brian Vastag: "...handicapped by uncertainties about how to calculate...ratings -- or whether it's even possible -- carbon-footprinting schemes struggle to be recognized as the standard stamps of eco-consciousness that the FairTrade, Energy Star and LEED systems have become...."
also see: California Watch: Carbon Footprint Varies by Location, Income
Example Carbon Footprint Calculator from The Nature Conservancy
Carbon Footprint Calculator from EPA
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