U.N.

Thousands of people are trapped in the Yarmouk camp, where water and supplies are lacking. The area under Syrian military siege for two years is now threatened by Islamic State militants.

Rajendra K. Pachauri's departure from the Intergovernmental Panel on Climate Change is a big embarrassment for the group, which won the 2007 Nobel Peace Prize along with former Vice President Al Gore.

Oct. 11 is the U.N.'s day devoted to stopping child marriage, stepping up education and much more. Does the day really help? Experts have a mixed reaction.