Hundreds rally in S.F. to fight global warming

A big crowd of environmentalists gathered on the grass at Crissy Field on Saturday to send a message to world leaders gathered for climate talks in Poland.

Organized by Greenpeace, the event brought about 300 people together to unfurl a banner that said, "Dear World Leaders, We Are Ready to Save the Climate."

Event coordinators said they want to urge the United States to commit to finding ways to reduce global-warming pollution.

A helicopter hovered over the huge postcard while a photographer hired by Greenpeace took aerial photos of the 30-by-50-foot banner. Organizers said the photo would be sent electronically today to the U.N. Framework Convention on Climate Change that is running until Friday in Poznan, Poland.