Chaitrali Ketkale, a graduate student in sustainability science, has won a summer fellowship from the Environmental Defense Fund (EDF), one of the world’s largest environmental advocacy groups. The EDF program trains and places fellows, chosen from 1,000 graduate-student applicants from leading universities. Ketkale will work in the New York office of Cushman & Wakefield, a global, multibillion-dollar commercial real estate firm.