Correction Appended: March 12, 2010
How green is your orange juice? A couple of years ago, PepsiCo, which owns the orange-juice brand Tropicana, tried to size up the carbon footprint of the popular morning tonic. It found that each half-gallon carton of OJ is responsible for 3.75 lb. of CO 2 .
What was particularly surprising was where much of that CO 2 was coming from. The single biggest contributor to Tropicana's carbon footprint wasn't the transport of the juice to stores or the energy required to operate a modern citrus farm. Rather, it was the fertilizer used...
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