CNN: World leaders arrived in Paris on Sunday for potentially historic climate talks that will play out amid security concerns driven by the November 13 terror attacks in France.
Frustrations over restrictions on protests put in place following the attacks gave rise to what French President Francois Hollande called "scandalous" scuffles between protesters and police at the Place de Republique, the site of a memorial to victims.
French authorities have clamped down on public demonstrations in the...