Much was left undecided at the UN climate-change summit that ended here on Dec. 12, with some contentious issues ignored and others softened in the final declaration. Clearly, climate negotiators have their work cut out for them in advance of next year’s pivotal meeting in Paris, France. Still, experts say enough progress was made to give negotiators at least a fighting chance of achieving the goal in Paris: adoption of a new international climate-protection accord that will take effect when the current one, the Kyoto Protocol, expires in 2020. “If we have to decide whether the glass is half full or half empty, I’d have to say it’s half full,” says Guy Edwards of Brown University’s Center for Environmental Studies. “A couple of... [Log in to read more]