UC Irvine is our first two-time winner. The Southern California school topped this list in 2014 and continues to dominate with strong all-around environmental practices. UCI is especially good at managing its trash (more than 80 percent of campus waste is diverted from landfills), getting energy from clean sources, and encouraging students and employees to step away from the car by offering train rebates, bus-pass discounts, and a free shuttle. In line with the UC system’s goal of becoming carbon neutral by 2025, UCI quadrupled its use of solar power in the past year, adding 11,700 panels in June to reduce its annual carbon emissions by 1,500 metric tons. In March, the school debuted UCI OCEANS, a multidisciplinary effort to save marine life. Above, students in UCI’s global sustainability program harvest cashews on a farm in Costa Rica.