The Emerald Tutu began as a simple idea for a new kind of coastal protection system to address flood risk in Boston — and as a commentary on the urban history of the city. “The spirit of the Emerald Tutu is to re-imagine what public infrastructure can do for citizens,” says Gabriel Cira ’08, CEO of The Emerald Tutu, Inc. “To address the true danger of climate change in Boston, we wanted to focus on making infrastructure green, inhabitable, and accessible, rather than reinforcing the division and erasure that Boston’s…