Ecobuild 2011: a constant flow of attendees from all over the world set the stage for an exciting three day event in London. There were plenty of helpful volunteers and good signage to direct people to wherever they needed to go. (Photo by Mignon O’Young)

Ecobuild 2011: a constant flow of attendees from all over the world set the stage for an exciting three day event in London. There were plenty of helpful volunteers and good signage to direct people to wherever they needed to go. (Photo by Mignon O’Young)

Ecobuild 2011: a constant flow of attendees from all over the world set the stage for an exciting three day event in London. There were plenty of helpful volunteers and good signage to direct people to wherever they needed to go. (Photo by Mignon O’Young)