Bloomberg: The path to a climate deal in Paris a year from now is littered with obstacles, foremost among them how to differentiate between what industrialized nations led by the U.S. will do to cut fossil-fuel pollution, and what commitments developing ones such as India, Brazil will take on.
Envoys from some 190 countries gathered in Lima last week took a step toward what will be the first deal binding all nations to limit greenhouse gases. While they sketched out what information countries must provide...