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GREENVILLE, S.C. — On one end of the classroom, high school juniors examined little green sprouts — future baby carrots, sprigs of romaine lettuce — poking out of the soil of a drip irrigation system they built a few weeks prior.
On the opposite end of the room, a model of a hydropower plant showed students how the movement of water can stimulate electrical currents. In this class in South Carolina’s Greenville County school district, students primarily learn about one topic: renewable energy…