Delegates listen as COP 20 President and Peru's Environment Minister Manuel Pulgar Vidal makes an announcement during a plenary session of the U.N. Climate Change Conference COP 20 in Lima December 12, 2014.
Medical staff working with Medecins sans Frontieres (MSF) prepare to bring food to patients kept in an isolation area at the MSF Ebola treatment centre in Kailahun July 20, 2014.
World Health Organization (WHO) Assistant Director General Bruce Aylward gestures during a news conference on the WHO response and challenges to control the Ebola outbreak at the United Nations in Geneva December 1, 2014.