Greenpeace activists hang off of the West End Bridge, one of Pittsburgh's iconic bridges under a massive banner displaying a message to G20 leaders gathering for their September 24 summit. The banner, nearly 80-feet by 30-feet (24 meters by 9 meters) in size, takes the form of a stylized road sign warning of the political maneuvering and delay that have put a international climate treaty in jeopardy as the world enters the final stretch on the road to Copenhagen.