we heard the pope speaking about human trafficking and said that the decisions to combat climate change should be on our collective conscious. what else was said? >> reporter: yesterday was a chance for the mayors to speak. they had ten minutes each to talk about what's happening in their cities to discuss the laws they enacted with regard to climate change and with regard to human trafficking and share some of their stories with one another. we heard from the mayor of madrid who said it's not enough to enact laws and they have to set a good example. so a lot of stories were shared yesterday and of course they had an opportunity to meet the pope. he said a few words to them. let take a look at what he had to say. mayors and governors from around the world applaud pope francis as he signs a declaration calling for bold action on