freetown, sierra leone. witnesses say large crowds had gathered to collect leaking todat stres toemand faster action on clim is was sydney, australia. but the biggest demonstration was at the site of the u.n. climate summit in glasgow, scotland. cbs' roxana saberi is there. ♪ ♪ ♪ >> reporter: to the tune of bag pipes, the beat of drums, and the patter of rain, tens of thousands of protesters marched across glasgow with an urgent message. the climate is in crisis and the time to act is now. >> inevitably, they're just going to put that off until it's too late. >> they keep delaying it until by the time that they actually do something, it's going to be too late. they need to start acting quicker. >> reporter: sandra guzman and tanya guyllem say developing nations like theirs in latin america need more help to adapt to climate change. >> we don't come and raise our voices, nobody is going to