NICE World leaders descended on the French Riviera Sunday ahead of a high-level summit to tackle a deepening crisis in the oceans driven by overfishing, climate change and pollution. The United Nations says oceans face an "emergency" and leaders gathering in Nice will be under pressure to commit much-needed money and stronger protections for the ailing seas and the people that depend on them. The U.N. Ocean Conference must try to turn a corner as nations feud over deep-sea mining, plastic