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I thought this was really interesting (then again, I've worked Thoreau's in friends' homes...)
http://www.nytimes.com/2008/10/28/science/earth/28wald.html?_r=1&scp=2&sq=thoreau&st=cse&oref=slogin
http://www.nytimes.com/2008/10/28/science/earth/28wald.html?_r=1&scp=2&sq=thoreau&st=cse&oref=slogin