Photo: USDA Thomas Vilsack COP21 (AP)

France Climate Countdown

U.S. Agriculture Secretary Thomas Vilsack speaks during a conference at the COP21, the United Nations Climate Change Conference Wednesday, Dec. 2, 2015 in Le Bourget, north of Paris. A record number of world leaders gathering in one place to discuss the single issue of climate change sends a strong signal, United Nations climate chief Christiana Figueres said.