Al Jazeera: Many across the world applauded last year when nearly 200 countries adopted the first ever agreement to address climate change. Proponents of the Paris agreement say the deal signals a global commitment to reduce greenhouse gasses, but critics call it "worthless", "weak" and "not strong enough". So, is the Paris agreement a historic victory or dangerous distraction? In the Arena, Mehdi Hasan asks UN Climate Chief Christiana Figueres if the Paris agreement is too little, too late.