As autumn gives way to winter, the historic Paris Agreement on climate change stands out all the more as a beacon of hope. By 2020, global commitments will have kicked in, making it look more like a dazzling light show.
A successor to the contentious Kyoto Protocol has been a long time coming, after diplomatic failure in Copenhagen and much cynicism. Seven years to be precise. But the speed of ratification of the Paris Agreement – less than a year – has been unprecedented.