Reuters: A single global price for carbon emissions is not likely for another 10 to 15 years because governments are dragging their heels on legislation, market analysts said on Wednesday. "By 2025, we could have one single currency," orbeo carbon analyst Emmanuel Fages said at a Point Carbon emissions trading conference in Copenhagen. The European Union’s executive Commission hopes to have a global carbon market in which emissions trading schemes are linked by 2020. It wants to see …