For California vintners, it's not easy being green

California wine is like Kermit the Frog, suggests a new study. It isn't easy being green. Wine made with organically grown grapes enjoy higher ratings than conventionally produced wines. So long as "organic" doesn't appear on the label, they also command a considerably higher price. But once vintners slap an eco-label on certified wines, the price premium evaporates. They sell for 7 percent less than their conventionally produced counterparts.

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