Photos: Climate change protests in Paris

A demonstrator in a mask walks past smoke as demonstators clash with French riot police during on Place de la Republique ahead of the COP21 World Climate Change Conference 2015 in Paris, France, 29 November 2015.

A woman is arrested by riot police after clashes during the demonstration at Republique Square on the eve of the COP21 Conference opening, in Paris, France, 29 November 2015.

Demonstrators clash with French riot police during on Place de la Republique ahead of the COP21 World Climate Change Conference 2015 in Paris, France, 29 November 2015.

Activists form a human chain during a protest ahead of the 2015 Paris Climate Conference, 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.