As the late September breeze blew trash across the Charles River Esplanade, Emerson Green Collective (EGC) and Emerson Sustainability volunteered to pick it up. About a dozen Emerson students scanned the yellowing fields Friday morning, equipped with blue surgical gloves, clear garbage bags, and trash pickers. They collected cigarette butts, leftover food packages, and other pieces of trash that littered the park and its waterfront. The event was a collaboration between EGC, Emerson Sustainability, and the Esplanade Association.