The winners of this year’s MADMEC competition identified a class of materials that could offer a more efficient way to keep greenhouses cool. After Covid-19 put the materials science competition on pause for two years, on Tuesday SmartClime, a team made up of three MIT graduate students, took home the first place, $10,000 prize. The team showed that a type of material that changes color in response to an electric voltage could reduce energy usage and save money if coated onto the panes of glass in greenhouses. “This project came…