"And even if in the face of this derision I decide I am going to bother, there arises the whole vexed question of getting it right. Is eating local or walking to work really going to reduce my carbon footprint? According to one analysis, if walking to work increases your appetite and you consume more meat or milk as a result, walking might actually emit more carbon than driving."

--Michael Pollan, writing in the NYTimes about going green behaviors.

Photo by Jon Fravelavel, flickr, cc license