Greenwire: Coal-fired power plants have continued to cut their soot- and smog-forming emissions this year, according to newly released estimates from U.S. EPA. Preliminary emissions data (pdf) for the first two quarters of 2010 show declines in total emissions as well as emissions intensity — the amount of pollution produced per unit of electricity. While some of the overall reductions reflect a 3 percent decrease in the amount of coal being burned at power plants, the intensity figures …