As winter approached in 2018, a curious plot of vegetables planted beneath neat rows of sloping solar panels on stilts at Manzo Elementary School in Tucson was still going strong. Greg Barron-Gafford, an associate professor at the University of Arizona’s School of Geography, Development and Environment, and his research team had watched the plants flourish under the panels’ shade throughout the summer, one of the hottest on record, and he was eager to see how long they would last.