Reuters: A US market in greenhouse gases is inevitable and President George W Bush should embrace trading now, so as to sharpen US efforts to slow global warming, European Commissioner Stavros Dimas said on Thursday. Dimas also told Reuters on the sidelines of a 17-nation climate conference in Paris that a plan by Bush unveiled on Wednesday to cap rising US emissions in 2025 recognised a need for ceilings but was not ambitious enough. "I ask myself why the president does not …