G-20 leaders meet to bolster global economy

Leaders representing 85 percent of the world's economic output were gathering Thursday in a U.S. city that has reinvented itself, hoping to bolster the global economy. The Group of 20 will meet for two days to focus on the worldwide financial crisis, and plot how to avoid a repeat in the future.

The White House is using the economic summit to showcase Pittsburgh -- a city that President Barack Obama says has exhibited an innovative 21st-century recovery after a well-publicized downfall following the shuttering of much of the city's steel industry.

Police boats pass under Greenpeace activists as they hang from a bridge near the G-20 summit.