Peace Boat's Ecoship is a transformational programme to construct the planet's most environmentally sustainable cruise ship. Peace Boat organised a multi-disciplinary charrette, bringing together world experts from fields as diverse as naval architecture, renewable energy, and biophilic and biomimetic design with the goal of defining the specifications for a ‘restorative’ vessel – where radical energy efficiency and closed material flow combine for a net positive impact on the environment. It will be a flagship for climate action. Its whole-system design and maximization of renewable energy use will enable 40% CO2 cuts. Ecoship was introduced in an official press conference at COP21.