Policemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (AP Photo/Laurent Cipriani)

Heavy Clashes As French Riot Police Use Sweeping Powers To Crack Down On Climate Protesters

Activists defy ban on demonstrations in Paris as more than 140 heads of state arrive for UN summit on climate change.