In greenwashing, as in life, there are seven sins. There's the sin of the hidden trade-off, for example, the sin of vagueness, and the sin of no proof. So says sinsofgreenwashing.org, which takes on companies that offer seemingly green benefits--often at a hefty price tag--with little results. As the green trend continues, companies in almost every industry vie for a piece of the green market, even the embattled General Motors (GM) has taken a chance on its own green product initiative.

But as the field of green products grows, so does the number of impostors.  

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