On October 24, Bostonians went down to Christopher Columbus Park on the waterfront to participate in mass street theater on the theme of "Boston Under Water." The idea of the event - being held in cities around the world - was to draw attention to the fact that unless we can keep CO2 levels at or below 350 parts per million, then global warming will accelerate and sea levels will rise. Organizers of the event included: Greenpeace USA, JP Green House, Massachusetts Council of Churches, Massachusetts Power Shift, Somerville Climate Action Sustainable Business Network of Greater Boston, and The Williams Agency. Co-Sponsors included: Boston Climate Action Network, Cambridge Green Decade, Greenport, Home Energy Efficiency Team, Living Structures, Inc., Massachusetts Coalition for Healthy Communities, Massachusetts Sierra Club, Medford Climate Action, Mystic River Watershed Association. For more information on the event, check out http://www.350.org/node/5998/.