Stephan Caldwell, left, and Jordan Bowman with Green Circle NC collect used cooking oil.
Stephan Caldwell, left, and Jordan Bowman with Green Circle NC collect used cooking oil. cseward@newsobserver.com
Stephan Caldwell, left, and Jordan Bowman with Green Circle NC collect used cooking oil. cseward@newsobserver.com

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September 01, 2014 7:11 PM

Entrepreneur supplies biodiesel to NC school buses

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