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

Entrepreneur supplies biodiesel to NC school buses

September 01, 2014 7:11 PM