Bloomberg: U.K. emissions of the greenhouse gases blamed for global warming fell 2 percent last year as the country took steps to meet its international treaty obligations. Output of six heat-trapping gases dropped to 623.8 million metric tons of carbon dioxide equivalent, from 636.6 million tons a year earlier, according to the Department of Energy and Climate Change, or DECC. Reduced fossil-fuel consumption by transport and manufacturing and lower use of coal to generate power led to …