tom friedan, and the world health organization speak at the university of pittsburgh medical center. about the ebola outbreak in west africa. you can see this event live at noon eastern on c-span2. >> the 2015 c-span student cam video competition is under way. open to all middle and high school students to create a five to seven-minute documentary on the theme, the three branches and you. showing how a policy, law or action by the executive, legislative or judicial branch of the federal government has affected you or your community. there's $200 cash prices for students -- 200 cash prices for students and teachers. for a list of rules and how to get started go to studentcam.org. >> president obama made the first of three appearances at the united nations this week. when he spoke at the u.n. climate summit on tuesday. his remarks are 15 minutes. >> mr. president, mr. secretary general, fellow leaders, for all the media challenges we are gathered to address his week, terrorism, instability, inequality, disease -- there is one issue that will define the contours of this it -- century mo