As nations around the world prepare to sign a global climate treaty in Paris this December at the United Nations Conference of the Parties (COP21), the U.N.’s climate chief has said thatthe world is still on track for dangerous warming. Most leaders and scientists have agreed that limiting the global average temperature rise to 2 degrees Celsius over the next century could yet ward off the worst effects of climate change . But the world remains on a trajectory to experience an increase of 3 C — even if the national emission reduction pledges to be codified in the Paris treaty are implemented — said Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change. Her comments came ahead of visiting Pope Francis’ U.N. General Assembly speech on Friday, when he is widely expected to weigh in on the dangers of climate change. Al Jazeera asked scientists […]